Sheri's age in 20 years will be the same as terry's age is now. ten years from now, terry's age will be twice sheri's. what are their present ages?

We have that

Sheri's age=x

terry's age=y

 in 20 years

x+20 =y   equation 1

 in 10 years

y+10=2*x   equation 2

 resolving

 y=x+20  equation 1

 y=2*x-10 equation 2

 x+20 =2*x-10

2*x-x=20+10

x=30

y=x+20y=30+20=50

Sheri's age=x30 years

terry's age=y50 years

its b i looked it up hope u get it right wish u luck