Question

13.
In class of 20 , the average mark of the first 19 sturdents is 25 and
the last 19 is 26. If the first boy get 16 marks, then the marks of the last boy is
a) 35
b) 25
d) 34
. c) 53​

Answer 1

Answer: 35

Step-by-step explanation:

Given the average mark of last 19 students = 26

Sum of marks of all the last 19 students = 26*19 = 494

Given the first boy marks = 16

Thus, sum of marks of all 20 students = 494 + 16

= 510

Given the average mark of first 19 students = 25

Sum of marks of all the last 19 students = 25*19 = 475

Sum of marks of all 20 students = Sum of marks of first 19 students +

   Marks of last student

=> Marks of last boy = Sum of marks of all 20 students -

Sum of marks of first 19 students

= 510 - 475

= 35.

Hence, Marks of last boy are 35.

Hope, it helped !