Adam has green and blue stickers in the ratio of 7 : 3.
He has 40 more green stickers than blue 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 blue stickers?
(a)
Number of green stickers = 7 u
Number of blue stickers = 3 u
Number of more green stickers than blue stickers
= 7 u - 3 u
= 4 u
4 u = 40
1 u = 40 ÷ 4 = 10
Number of stickers that Adam has
= 7 u + 3 u
= 10 u
= 10 x 10
= 100
(b)
Number of green stickers after Adam gives away 30
= 7 u - 30
= 7 x 10 - 30
= 70 - 30
= 40
Number of blue stickers
= 3 u
= 3 x 30
= 30
New ratio of the number of green stickers to blue stickers
40 : 30
(÷ 10) 4 : 3
Answer(s): (a) 100; (b) 4 : 3