Adam has blue and green stickers in the ratio of 7 : 3.
He has 80 more blue stickers than green stickers.
- How many stickers does Adam have?
- If Adam gives away 40 blue stickers, what is the new ratio of the number of blue stickers to green stickers?
(a)
Number of blue stickers = 7 u
Number of green stickers = 3 u
Number of more blue stickers than green stickers
= 7 u - 3 u
= 4 u
4 u = 80
1 u = 80 ÷ 4 = 20
Number of stickers that Adam has
= 7 u + 3 u
= 10 u
= 10 x 20
= 200
(b)
Number of blue stickers after Adam gives away 40
= 7 u - 40
= 7 x 20 - 40
= 140 - 40
= 100
Number of green stickers
= 3 u
= 3 x 40
= 60
New ratio of the number of blue stickers to green stickers
100 : 60
(÷ 20) 5 : 3
Answer(s): (a) 200; (b) 5 : 3