Question

evan is 7 years younger that his sister. the sum of their age is 37. using any method, find their age.

Answer 1

So since we don’t know both of their ages we need to use a variable!
7+x+x=37
7+2x = 37
2x=30
x = 15

15 - 7 = 8

Evan - 8
Sister - 15