1/3 of the stickers in the packet are red. 1/2 of them are blue andthe rest are yellow. There are 90 less red stickers than blue stickers.How many stickers are there altogether in the packet?
numer of stickers ---- x
reds = 1/3 x
blues = 1/2 x
blue = red+ 90
1/2 x = 1/3 x + 90
times 6
3x = 2x + 540
x = 540
there are a total of 540 stickers (nobody cared about the yellows)