Adam has green and blue stickers in the ratio of 7 : 5.
He has 80 more green stickers than blue stickers.
- How many stickers does Adam have?
- If Adam gives away 40 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 = 5 u
Number of more green stickers than blue stickers
= 7 u - 5 u
= 2 u
2 u = 80
1 u = 80 ÷ 2 = 40
Number of stickers that Adam has
= 7 u + 5 u
= 12 u
= 12 x 40
= 480
(b)
Number of green stickers after Adam gives away 40
= 7 u - 40
= 7 x 40 - 40
= 280 - 40
= 240
Number of blue stickers
= 5 u
= 5 x 40
= 200
New ratio of the number of green stickers to blue stickers
240 : 200
(÷ 40) 6 : 5
Answer(s): (a) 480; (b) 6 : 5