Adam has green and red stickers in the ratio of 3 : 1.
He has 40 more green stickers than red stickers.
- How many stickers does Adam have?
- If Adam gives away 30 green stickers, what is the new ratio of the number of green stickers to red stickers?
(a)
Number of green stickers = 3 u
Number of red stickers = 1 u
Number of more green stickers than red stickers
= 3 u - 1 u
= 2 u
2 u = 40
1 u = 40 ÷ 2 = 20
Number of stickers that Adam has
= 3 u + 1 u
= 4 u
= 4 x 20
= 80
(b)
Number of green stickers after Adam gives away 30
= 3 u - 30
= 3 x 20 - 30
= 60 - 30
= 30
Number of red stickers
= 1 u
= 1 x 30
= 20
New ratio of the number of green stickers to red stickers
30 : 20
(÷ 10) 3 : 2
Answer(s): (a) 80; (b) 3 : 2