The sum of the ages of 5 children is 20 years. After how many years will the sum of their ages be 40 years?

?

?A)4
B)5
C)10
D)20
Please answer fast!!
With reason!

Dear student
The sum of their ages is 20, making their average age 205= 4 years When the sum of their ages is 40, their average will be 405 =8 yearswhich is 4 years from now.So, After 4 years the sum of their ages will be 40 yearsNote: Average=Sum of numbersTotal no. of numbers
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