Adam has green and blue stickers in the ratio of 5 : 3.
He has 80 more green stickers than blue stickers.
- How many stickers does Adam have?
- If Adam gives away 20 green stickers, what is the new ratio of the number of green stickers to blue stickers?
(a)
Number of green stickers = 5 u
Number of blue stickers = 3 u
Number of more green stickers than blue stickers
= 5 u - 3 u
= 2 u
2 u = 80
1 u = 80 ÷ 2 = 40
Number of stickers that Adam has
= 5 u + 3 u
= 8 u
= 8 x 40
= 320
(b)
Number of green stickers after Adam gives away 20
= 5 u - 20
= 5 x 40 - 20
= 200 - 20
= 180
Number of blue stickers
= 3 u
= 3 x 20
= 120
New ratio of the number of green stickers to blue stickers
180 : 120
(÷ 60) 3 : 2
Answer(s): (a) 320; (b) 3 : 2