Question

Ali has some blue, red and green stickers. 2/9 of the stickers and another 20 stickers are blue. 1/3 of the remaining stickers and another 60 stickers are
red. The rest of the stickers are green. There are 90 green stickers.
(a) How many red stickers does Ali have?
(b) Find the total number of stickers Ali has.

Answer 1

If there are x stickers,
blue = 2/9 x + 20
red: 1/3 (x - (2/9 x + 20)) + 60
green: the rest
so, that means
2/9 x + 20 + 1/3 (x - (2/9 x + 20))+60 + 90 = x
x = 315
so red = 135