the average score of a class drops by 1 when marks of a student are reversed if the digits of marks scored by that child differed by 4 how many students are there in the class
A.32
B.24
C.36
D.48
Answers
Answer:
B 24 the correct answer tnx
Given : the average score of a class drops by 1 when marks of a student are reversed
the digits of marks scored by that child differed by 4
To Find : how many students are there in the class
A.32
B.24
C.36
D.48
Solution:
Let say score of that particular student = XY
X = Y + 4
on interchange score is YX
Value of XY = 10X + Y
Value of YX = 10Y + X
=> 10X + Y - 10Y - X
= 9(X - Y)
= 9 (4)
= 36
Hence Total score reduced by 36
average reduced by 1
number of students = 36 / 1 = 36
Hence 36 students in class
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