Cody is twice as old as evan and seven years ago the sum of their age was 10. find the age of each boy now.

Let Cody be x years old now. and y be Evan's age now.

x = 2y

x - 7 + y - 7 = 10

x + y = 24

Substitute for x = 2y:-

2y + y = 24

y = 8

and therefore

x = 2*8 = 16

Answer is Cody is now 16 and Evan is 8