Adam has blue and green stickers in the ratio of 7 : 2.
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 = 2 u
Number of more blue stickers than green stickers
= 7 u - 2 u
= 5 u
5 u = 80
1 u = 80 ÷ 5 = 16
Number of stickers that Adam has
= 7 u + 2 u
= 9 u
= 9 x 16
= 144
(b)
Number of blue stickers after Adam gives away 40
= 7 u - 40
= 7 x 16 - 40
= 112 - 40
= 72
Number of green stickers
= 2 u
= 2 x 40
= 32
New ratio of the number of blue stickers to green stickers
72 : 32
(÷ 8) 9 : 4
Answer(s): (a) 144; (b) 9 : 4