Find theTotal Number of Children in The Class?
Answer: (3) 42
Let the number of children be X
The number of boys in a class is three times the number of girls.
Then, the number of girls = X
Therefore, the number of boys = 3 X
So, the total number of children = X + 3 X
= 4 X
Then, the number of children must be divisible by 4.
Here, only 48, 44 and 40 are the divisible by 4 and 42 is not divisible by 4.
Then, 42 cannot represent the total number of children in the class.
Hence, the answer is (3) 42.