Question

!!PLEASE HELP!! Sheri’s age in 20 years time will be the same as Terry’s age is now. Ten years from now, Terry’s age will be twice Sheri’s age. What are their ages presently?

Answer 1

It could be anything, but when you subtract it the answer should be 10. 

Answer 2

Sheri's age = 10

Terry's age = 30

Explanation:

Sheri’s age in 20 years time will be the same as Terry’s age is now. Ten years from now.

Let T be the Terry's age

And S be the Sheri's age

`S+20= T`

Ten years from now, Terry’s age will be twice Sheri’s age

`T+10= 2(S+10)`

`T+10= 2S+20`

Subtract 10 from both sides

`T= 2S+10`

Now we replace T by 2S+10 in the first equation

`S+20= T`

`S+20= 2S+10`

Subtract S from both sides

`20=S+10`

Subtract 10 from both sides

S= 10

`T= 2S+10`

`T= 2(10)+10=30`

Sheri's age = 10

Terry's age = 30