If 149 green stickers are added, 40% of the stickers will be blue stickers.
If 141 blue stickers are added, 25% of the stickers will be green stickers.

1. How many green stickers are there? 
2. How many blue stickers are there? 

	Scenario 1		Scenario 2
	Green	Blue	Green	Blue
Before	3 u - 149	2 u	1 p	3 p - 141
Change	+ 149	No change	No change	+ 141
After	3 u	2 u	1 p	3 p

(a)
40% = ⁴⁰₁₀₀ = ²₅
25% = ²⁵₁₀₀ = ¹₄

Scenario 1
Fraction of the stickers that are green
= 1 - ²₅
= ³₅

Number of green stickers at first = 3 u - 149
Number of blue stickers at first = 2 u

Scenario 2
Fraction of the stickers that are blue
= 1 - ¹₄
= ³₄

Number of green stickers at first = 1 p
Number of blue stickers at first = 3 p - 141

3 u - 149 = 1 p --- (1)

2 u = 3 p - 141
2 u + 141 = 3 p --- (2)

(1) _{x 3}
9 u - 447 = 3 p --- (3)

(3) = (2)
9 u - 447 = 2 u + 141
9 u - 2 u = 447 + 141
7 u = 588

1 u = 588 ÷ 7 = 84

Number of green stickers
= 3 u - 149
= 3 x 84 - 149
= 252 - 149
= 103

(b)
Number of blue stickers
= 2 u
= 2 x 84
= 168

Answer(s): (a) 103; (b) 168