Postal Government Jobs Exams Numerical Ability

The average age of five members of a family is 22 years.if youngest member is 5 year old,what was the average age of family at the time of the birth of youngest member?

(a)21 years
(b)22 1/2 years
(c)21 1/4 years
(d)none of these

Read Solution (Total 1)

c)21 1/4

Average age of 5 members = 22
Sum of age of 5 member = 22*5 = 110

5 years before, sum of their ages = 110 - 5*5
= 85

Average age of 4 members at the time of birth of youngest = 85/4
= 21 1/4 years
10 years agoHelpfull: Yes(1) No(0)

Postal Other Question

In a class there are 80 students and their average marks in the annual examination is 45.If the average marks of passed students is 55 and the average marks of failed students is 30,then find out the number of students who failed.

(a)48
(b)32
(c)36
(d)None of these Radhika,sanya and devika can do a piece of work in 36,48 and 72 days respectively. They work alternativey,First day-Radhika,second day-Sanya,Third day-Devika,Fourth day-Radhika and so on.How many days will be needed to complete the work like this way?

(a)48 days
(b)36 days
(c)45 days
(d)None of these