Question

the age of three children is 20 the total age of two is 40 find the age of the third child​

Answer 1

According to your question. I think there a three children each having age of 20. So the total age of 2 children is 40 therefore the 3rd child’s age will be —
Let the third child’s age be - x.
A.T.Q.

20 + 20 + x = 60.
Now, 40 + 20 = 60.
Or, x = 60 - 40.
Then, x = 20.
Then the third child’s age is 20.