Question

tonya is twice kevins age in 3 years tonya will be 17 how old is kevin

Answer 1

Kevin is 7 years old and Tonya is 14

Answer 2

I'm not sure if you can do this but..:
\[\LARGE 2x+3=17\]
x=Tonya's age
\[\LARGE 2x=14\]
Divide:
\[\LARGE x=7\]