If 335 red stickers are added, 40% of the stickers will be blue stickers.
If 199 blue stickers are added, 25% of the stickers will be red stickers.

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

	Scenario 1		Scenario 2
	Red	Blue	Red	Blue
Before	3 u - 335	2 u	1 p	3 p - 199
Change	+ 335	No change	No change	+ 199
After	3 u	2 u	1 p	3 p

(a)
40% = ⁴⁰₁₀₀ = ²₅
25% = ²⁵₁₀₀ = ¹₄

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

Number of red stickers at first = 3 u - 335
Number of blue stickers at first = 2 u

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

Number of red stickers at first = 1 p
Number of blue stickers at first = 3 p - 199

3 u - 335 = 1 p --- (1)

2 u = 3 p - 199
2 u + 199 = 3 p --- (2)

(1) _{x 3}
9 u - 1005 = 3 p --- (3)

(3) = (2)
9 u - 1005 = 2 u + 199
9 u - 2 u = 1005 + 199
7 u = 1204

1 u = 1204 ÷ 7 = 172

Number of red stickers
= 3 u - 335
= 3 x 172 - 335
= 516 - 335
= 181

(b)
Number of blue stickers
= 2 u
= 2 x 172
= 344

Answer(s): (a) 181; (b) 344