Question 1026666
 Jill is 10 years younger than Brian.
j = b - 10
:
 In 5 years, Jill will be two-thirds of Brian's age.
j + 5 = {{{2/3}}}(b+5)
get rid of the fraction, multiply both sides by 3
3(j+5) = 2(b+5)
3j + 15 = 2b + 10
3j = 2b + 10 - 15
3j = 2b - 5
Replace j with (b-10) from the first statement
3(b-10) = 2b - 5
3b - 30 = 2b - 5
3b - 2b = -5 + 30
b = 25 yrs is Brian's age
then
j = 25 - 10
j = 15 yrs is Jill's age
:
 how old will Jill be seven years from now?
I'll let you figure this out