Julian collected 5 times as many stickers as Robert. When Julian gave Robert some of his stickers, they each had 9. How many stickers had Julian given to Robert?
+36916 j = 5r
j- s = r + s
5r-s = 9 s = 'some stickers'
r+s = 9 add these two equations
6r = 18
r = 3 then j = 5r = 15
r + s = 9
3 + s = 9
s = 6
