Question

4 friends want to go to a concert but they are waiting for there friend. 3 of them are 18, one is 16. How old is the last friend?

Answer 1

Let us take 4 friends as A,B,C,D
so by given condition
A=18
B=16
A+B=18+16=34
so
A+B+C+D=X
but a+b=34
34+C+D=X
but this question is incomplete becoz in order to find the 4th persons age u need at least 3 ages or some ratio of their ages and their conditions
so pls recheck ur question.
hopefully I will help u!!!