Question 1119831
Jenny has a younger sister Rose.
j = Jenny's present age; r = Rose's
:
Write an equation for each statement, simplify
 Five years ago, Jenny was 10 times as old as Rose.
j - 5 = 10(r-5)
j - 5 = 10r - 50
j = 10r - 50 + 5
j = 10r - 45
:
 Three years from now, Jenny will be twice as old as Rose.
j + 3 = 2(r + 3)
j + 3 = 2r + 6
j = 2r + 6 -3
j = 2r + 3
:
j = j therfore
10r - 45 = 2r + 3 
10r - 2r = 3 + 45
8r = 48
r = 48/8
r = 6 yrs is Roses age
Find j
j = 2(6) + 3
j = 12 + 3
j = 15 is Jenneys age
:
a) What are Jenny and Rose's present age? Obviously 15 and 6
:
b) How old was Jenny when Rose was born? 
Subtract Rose's age from Jenny's