Question

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.

Answer 1

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