The average weight of 19 students was 50 kg. By the admission of a new student the average weight is

phanikumar   8 years AGO

x/19=50 and y/20=49.6
x=950 and y=992
so new age is y-x=992-950=42

Like? Yes (4) | No (2)  

Lakshmi Narayanan.k   8 years AGO

the avg of 19 students is 50kg.
sum 0f 19 students=19*50=950.
sum of 20 students=20*49.6=992.(992-950=42) opt 7

Like? Yes (3) | No (1)  

dokku vasu yadav   8 years AGO

intially the given average of 19 students is 50 by means of calculating the total weight of all students is 950 and by means of adding one extra student the average to 49.6
adding the extra weight of 42 kg to the 950 we get
992/20=49.6

Like? Yes (1) | No   

Nrupesh A N   8 years AGO

total weight of 20 people is 992 .and total weight of 19 people 950..so 992-950=42

Like? Yes (1) | No   

shipra bharti   8 years AGO

sum of weight of 19 student is 950kg
and sum of 20 student is 992kg
so now weight of new student is 992-950

Like? Yes (1) | No   

ANAND MOHAN RAI   8 years AGO

weight of new student=49.6*20-50*19=42 kg
hence option 7)

Like? Yes | No   

Sandip Das   8 years AGO

weight of new student=(total weight of 20 student)-(total weight of 19 student)
=(20*49.6)-(19*50)
=992-950
=42 (option 7)

Like? Yes (1) | No (1)  

Y M ANIEF   8 years AGO

Total weight of 19 students=19*50
950
Including 20th student=20*49.6=992
20 students - 19 students weight=new student weight
992-950=42

Like? Yes | No   

Dinesh kumar sah   8 years AGO

Sum of weight of 19 students=950 kg
Let the age of new student is x kg.
then according to the question,
(950+x)/20=49.6
so x=42kg Ans
Hence option (7) is the right answer.

Like? Yes (1) | No (1)  

Vignesh.S   8 years AGO

average weight of 19 student is 50 therefore the sum of weight of 50 student is 950

now (950+x)/20 =49.6

by solving this we get x as 42

therefor the answer is 42

option(7)

Like? Yes | No   

RAMPALA JYOTHI   8 years AGO

let weight of 19 students is x;
and weight of new student is y;
avg weight of 19 students (x/19)=50;
then x=950;
with new student avg weight is
((x+y)/20)=49.6;
y=(49.6*20)-(950);
y=42.00.
so weight of new student is 42kg.

Like? Yes | No   

vasantha kumar kalli   8 years AGO

total weight=19*50=950.
total weight after adding person=20*49.6=992
so the difference =992-950=42

Like? Yes | No   

Dinesh Sharma   8 years AGO

let total weight of 19 students = x
Therefore, x/19 = 50 i.e. x= 950

Now one more student take admission, it means total students = 20

now assume total weight of 20 students = y
so, y/20 = 49.6 i.e. y = 992

Therefore weight of new student = 992 - 950 = 42 kg , so option(7) is correct answer.

Like? Yes | No   

naveenkumar   8 years AGO

19*50=950
49.6*50=992
992-950=42
ans=42

Like? Yes | No   

amit dixit   8 years AGO

50*19=950
49.6*20=992

992-950=42

Like? Yes | No   

Anamika singh   8 years AGO

reduce in average=50-49.6=0.4kg
reduce in average total=20×0.4=8kg
so the weight of new student=50-8=42kg👍

Like? Yes | No   

Govind Sharma   8 years AGO

old total weight = 19*avg.
old total weight = 19*50
old total weight = 950

new total weight = 20*49.6
new total weight = 992kg

therefore weight of newly added guy is = 992-950
= 42kg

Like? Yes | No   

Uneet Kumar Singh   8 years AGO

Total weight of the students = 19*50
let weight of the new student be x then new average is (19*50 + x)/20
Equating it to to 49.6 and solving it for x we get x=42

Like? Yes | No   

vanshika agarwal   8 years AGO

Let the sum of wieght of 19 people is X kg then
X/19=50
X=950kg

Now,
Let the weight of next added person be Y kg then,

(X+Y)/20 = 49.6

Hence by putting X= 950
Y= 42 kg..which is the required answer..

Like? Yes | No   

sowmya   8 years AGO

avg(19 students)= 50 kgs
sum(19 students)= 50*19= 950 kgs
avg(20 students)= 49.6kgs
sum of 20 students= 992kgs
weight of new student= sum of 20 students- sum of 19 students
=992-950
=42 kgs

Like? Yes | No   

SAI VISWANADH KINTALI   8 years AGO

(a1+a2+......+a19)/19=50
a1+a2+....+a19=50*19=950 -------> eq1

(a1+a2+a3+........+a19+a20)/20=49.6
a1+a2+.....+a19+a20=49.6*20=992
950+a20=992 (from eq1)
a20=992-950=42

Like? Yes | No   

sai sreenivas   8 years AGO

The total weight of 19 students is 19*50=950
The weight of 20 students after admission of a new student is 20*49.6=992.
The weight of the new student is 992-950=42.

Like? Yes | No   

gulshan   8 years AGO

(19*50+x)/20=49.6
(950+x)/20=49.6
950+x=49.6*20
950+x=992
x=42

Like? Yes | No   

Samjukta Das   8 years AGO

Sum of ages of 19 students= 50*19=950
Now there are 20 students after adding a new student

Now 20*49.6=992

Weight of student added=992-950=42kg

Like? Yes | No   

NATARAJ   8 years AGO

the total of 19 students is 950 and next after new one enter the total of 20 students is 992 so the diff is the new student weight. the weight of new student is 42.

Like? Yes | No   

Nwobi Chibuzor    8 years AGO

Let the sum of the weight of all students be Z.
Therefore, Z÷19=50 gives Z=950.
Let the weight of the new student be Y.
Therefore, (950+Y)÷20=49.6 which makes Y=42

Like? Yes | No   

RIYA GUPTA   8 years AGO

Average weight*Number of students=50*19=950
New average weight*Number of students=49.6*20=992.0
Now 992-950=42kg
Weight of new student=42kg

Like? Yes | No   

Sahil dandawate   8 years AGO

(W1+w2+.....w19)/19=50
W1+w2+.....w19=950
Now , (w1+w2+w3+.....w20)/20=49.6
W20 =492-450=42

Like? Yes | No   

Divya   8 years AGO

sum of weights of students/no. of students=average weight
=>sum of weights of 19 students= 19*50
=950.
now,
let the weight of the new student be x.
=>(950+x)/20=49.6
=>950+x=992
=>x=42kg.

Like? Yes | No   

Divya   8 years AGO

first taken tha avg of 19 mem
x/19=50=>950
next avg of 20 mem
x/20=49.6=>992
age of new student=992-950=42

Like? Yes | No   

Siva   8 years AGO

Total weight of 19 students is 950, after add a student total weight is 992, so the weight of added student is 42

Like? Yes | No (1)  

JAYA TRIPATHI   8 years AGO

let the weight of 20 students is x1, x2, x3........x20
now,given that
x1+x2+x3+......+x19/19 = 50kg
=> x1+x2+x3+....+x19 = 50*19
= x1+x2+x3+....+x19 = 950kg
again, given
x1+x2+x3+.....+x20/20 = 49.6kg
=> x1+x2+x3+.....+x20 = 49.6*20
=x1+x2+x3+.....+x20 = 992kg
=950+x20 = 992
=> x20 = 992-950= 42kg
therefore the weight of new student is 42kg.

Like? Yes | No (1)