Adam has some blue stickers and green stickers.
If Adam receives another 850 green stickers,
the blue stickers will be 20% as many as the green stickers.
If Adam receives another 10 blue stickers,
the blue stickers will be 80% as many as the green stickers.

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

	Scenario 1		Scenario 2
	Blue	Green	Blue	Green
Before	1 u	5 u - 850	4 p - 10	5 p
Change	No change	+ 850	+ 10	No change
After	1 u	5 u	4 p	5 p

(a)
20% = ²⁰₁₀₀ = ¹₅
80% = ⁸⁰₁₀₀ = ⁴₅

Scenario 1
Number of blue stickers at first = 1 u
Number of green stickers at first = 5 u - 850

Scenario 2
Number of blue stickers at first = 4 p - 10
Number of green stickers at first = 5 p

1 u = 4 p - 10 --- (1)
5 u - 850 = 5 p --- (2)

(2) _{÷ 5}
1 u - 170 = 1 p
1 u = 1 p + 170 --- (3)

(1) = (3)
4 p - 10 = 1 p + 170
4 p - 1 p = 10 + 170
3 p = 180

1 p = 180 ÷ 3 = 60

Number of blue stickers
= 4 p - 10
= 4 x 60 - 10
= 240 - 10
= 230

(b)
Number of green stickers
= 5 p
= 5 x 60
= 300

Answer(s): (a) 230; (b) 300