Adam has red and green stickers in the ratio of 5 : 3.
He has 70 more red stickers than green stickers.
- How many stickers does Adam have?
- If Adam gives away 40 red stickers, what is the new ratio of the number of red stickers to green stickers?
(a)
Number of red stickers = 5 u
Number of green stickers = 3 u
Number of more red stickers than green stickers
= 5 u - 3 u
= 2 u
2 u = 70
1 u = 70 ÷ 2 = 35
Number of stickers that Adam has
= 5 u + 3 u
= 8 u
= 8 x 35
= 280
(b)
Number of red stickers after Adam gives away 40
= 5 u - 40
= 5 x 35 - 40
= 175 - 40
= 135
Number of green stickers
= 3 u
= 3 x 40
= 105
New ratio of the number of red stickers to green stickers
135 : 105
(÷ 15) 9 : 7
Answer(s): (a) 280; (b) 9 : 7