The average age of a family of 6 members is 22 years. If the age of the youngest member be 7 years,

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14 Jul 2015 Average

The average age of a family of 6 members is 22 years. If the age of the youngest member be 7 years, the average age of the family at the birth of the youngest member was

OPtion

1) 15 years
2) 15.5 years
3) 16 years
4) 16.5 years
5) 17 years
6) 17.5 years
7) 18 years
8) 18.5 years
9) 19 years
10)19.5 years

Solution

Total present age of the family (6*22) = 132 years
Total age of the family 7 years ago = (132 - 7*6) = 90 years
At that time, the number of member = 5
Therefore Average age at that time = 90/5 = 18 years

Option 7)

Correct Option: 7 Best Solution (28)

akanksha   9 years AGO

total age of all the 6 family members=22*6=132
7 years ago the youngest member was not there and the other members were 7 years younger than now.so the total age of a family of 5 members will be 132-(7*6)=90.therefore the average age of 5 members will be 90/5=18

Like? Yes (37) | No (8)  

SHUBHAM RAJ   9 years AGO

sum of age of 6 membar= 22*6= 132
sum of age of 5 member excluding yonger one= 132-7 =125

av. age of 5 member= 125/5= 25

av. age at the time of birth=25-7 =18

Like? Yes (34) | No (17)  

Reeniya Bopaiah A   9 years AGO

let average age of five people be x
5*x+7=6*22
x=25
average age before youngest was born is 25-7=18

Like? Yes (14) | No (4)  

Patralika Mitra   9 years AGO

18 yrs

The average age of a family of 6 members is 22 years.
Total age now = 22*6=132 years

If the age of the youngest member be 7 years,
Total age of 5 members 7 years ago = 132 -6*7 = 132-42 = 90 years
then the average age of the family of 5 members just before the birth of the youngest member = 90/5 = 18 yrs
the average age of the family of 6 members just after the birth of the youngest member = 90/6 = 15 years
Read more at http://www.m4maths.com/9566-The-average-age-of-a-family-of-6-members-is-22-years-If-the-age-of-the-youngest-member-be.html#hu1dFsfju9OvUzQW.99

Like? Yes (7) | No (1)  

SOMA NARESH   9 years AGO

sum of ages of 6 members = 22*6 = 132
sum of ages of 5 members + youngest one = 132
sum of ages of 5 members = 132-7 = 125
before 7 years the ages of each person is reduced by 7.
so total age reduced from all members = 7*5 = 35

before 7 years sum of ages of 5 members = 125-35 = 90
average age of 5 members = 90/5 = 18
Option(7)

Like? Yes (11) | No (8)  

MRITUNJAY   9 years AGO

total age= 22*6=132
age at the birth of youngest member=7*6=42
remaining age of family=132-42=90
average =90/5=18

Like? Yes (4) | No (2)  

vishal kumar   9 years AGO

At present the total age of the family = 6 * 22 =132

The total age of the family at the time of the birth of the youngest member = [132-7-(7*5)] = 90

Therefore, average age of the family at the time of birth of the youngest member = 90/5 = 18

Like? Yes (5) | No (4)  

DEEPAK RAJ   9 years AGO

Total age of family = 22*6 =132 years
7 years earlier, total age = 132- (7*6) = 90 years
So, Avg age = 90/5 = 18 years

Like? Yes (3) | No (3)  

sudiptaa   9 years AGO

Total age of the family = 22*6 = 132
total age before birth of the youngest member = 132-7-(7*5)=90
Avg age = 90/5=18 years

Like? Yes (2) | No (2)  

pankaj kumar   9 years AGO

total age of family member = 132
at the birth of youngest member total age of family member = 132- 6*7= 90
at birth of youngest member average age of family is 90/5= 18. option 7 is correct ans...

Like? Yes (1) | No (1)  

Deepak kushwaha   9 years AGO

here average age of 6 family member is 22
then total age of family member =6*22=132
now at the birth of youngest member or & 7 years ago
total age of family is 132-42=90
now the family member is 5 (7 years ago)
so avg. age of 5 family member is 90/5=18(option 7)

Like? Yes (3) | No (3)  

sanu kumar verma   9 years AGO

present sum of age of family member=22*6=132 year now age of family member 7 year ago is 132-6*7=90 year now average age of family at the birth of youngest member is 90/5=18 yeari.e 18 year is answer

Like? Yes (4) | No (4)  

Supraja   9 years AGO

Tot age=6 x 22 =132
At the birth of youngest member (ie) before 7 years
7 x 6 =42(total age of 5 members)
Total age before 7 years =132-42=90
Average age= 90/5=18

Like? Yes (1) | No (1)  

pooja jha   9 years AGO

sum of the ages of 6 family member is 122*6=132.

sum of the ages of all the family member during birth of youngest = 132-(7*6) = 90.
therefore average age during the time of birth of youngest = 90/5=18

Like? Yes (1) | No (1)  

neha gupta   9 years AGO

The average age of six members is - 22
So their sum of ages = 22*6=132
the age of youngest member is 7, so the sum of ages of rest five members is = 132-7=125
7 years ago their sum og age had been = 125-(7*5) = 125-35 = 90
So the average is 90/5=18 years.

Like? Yes (1) | No (1)  

Surit Datta   9 years AGO

The average age of a family of 6 members is 22 years.
Total age now = 22*6=132 years

If the age of the youngest member be 7 years,
Total age of 5 members 7 years ago = 132 -6*7 = 132-42 = 90 years
then the average age of the family of 5 members just before the birth of the youngest member = 90/5 = 18 yrs
so option 7
that's it.

Like? Yes (3) | No (4)  

nirmal kumar saini   9 years AGO

because at the birth time of youngest member the average age is 15 including the birth child.
so we have to remove the birth child.so the sum of all age is 90 which must be devided by 5 to get the average
so average sum of the family is
90/5=18;

Like? Yes (2) | No (3)  

anand kumar   9 years AGO

total age=6x22=132
sum of age 5 members other than youngest=132-7=125
7 years earlier age= 125-35=90
average=90/5=18

Like? Yes (2) | No (3)  

Soma Naresh   9 years AGO

total age of 6 persons=22×5=132
total age excluding youngest one=132-7=125
total age of 5 members=125
before 7 years total age reduced by 5 from each member
so total age=125-(7×5)=125-35=90
average age of 5 members before birth of youngest one =90/5=18
Option (7)

Like? Yes (1) | No (2)  

POOJA SINGH   9 years AGO

At present the total age of the family = 6*22 = 132

The total age of the family at the time of the birth of the youngest member = [132-7-(7*5)] = 90

Therefore, average age of the family at the time of birth of the youngest member = 90/5 = 18

Like? Yes (4) | No (5)  

Asha Verma   9 years AGO

Sum of ages= average×number of members. So sum= 22× 6= 132
Now seven years before sum of average = 132-(7×6)=90.
Then average at the time of born of youngest member= 90/5= 18

Like? Yes (1) | No (2)  

santosh kumar patel   9 years AGO

The total age as of now = 22x6=132 years
so the age of 5 members excluding the youngest one= 132-7=125 years .

The youngest person was born 7 years before. So at that time the age of other five members in total was 125-7x5=90 years.

and their average was 90/5 =18 Years

Like? Yes (2) | No (3)  

Archie   9 years AGO

Avg age of 6 members=22
Sum of their ages =22*6 =135
sum of age 7 yrs ago i.e at the birth of youngest member
=132-(7*6)
=90
Required Avg age=90/5=18yrs
Option 7

Like? Yes (1) | No (2)  

krishna chandrika   9 years AGO

x1+x2+x3+x4+x5+x6=22*6

x6=7

x1+x2+x3+x4+x5=132-7=125

7yrs back

x1+x2+x3+x4+x5=125-(7*5) = 90

average = 90/5 = 18

Like? Yes (2) | No (3)  

vivek kashyap   9 years AGO

Total age of members = 6 x 22 = 132 yr

7 years ago,
total sum of ages = 132 – (6 x 7) = 90 yr

so average= 90 /5 = 18 years

Like? Yes (1) | No (2)  

kvsnlr   9 years AGO

since avg od all gamily mem is 22 sum of all agds would be 22×6 subtracting the age of youngest boy from th sum we get some of remaining members and this sum diveded by 5 would give avg as 7 yrs agi each ones age must be subtracted b 7 yhe avg also reduced by 7 so 25-7=18

Like? Yes (2) | No (3)  

sourav pal   9 years AGO

The total age as of now = 22x6=132 years and so the age of 5 members excluding the youngest one= 132-7=125 years .

The youngest person was born 7 years before. So at that time the age of other five members in total was 125-7x5=90 years.

and their average was 90/5 =18 Years

Like? Yes (2) | No (4)  

vimal tiwari   9 years AGO

sum of 5 member age = 22*6 - 7 =125;
avg = 125/5 =25
7 years ago = 25-7=18

Like? Yes (2) | No (4)