The ratio of the number of blue stickers to green stickers is 4 : 3.
After Adam gives away 93 blue stickers and gives away 68 green stickers,
the ratio becomes of the number of blue stickers to green stickers is 5 : 2.
How many stickers does Adam have now?
|
Make p the same (1) x 2 = (3) |
(1) Blue |
(2) Green |
Make p the same (2) x 5 = (4) |
Before |
8 u |
4 u |
3 u |
15 u |
Change |
- 186 |
- 93 |
- 68 |
- 340 |
After |
10 p |
5 p |
2 p |
10 p |
4 u - 93 = 5 p --- (1)
3 u - 68 = 2 p --- (2)
Make p the same.
(1) x 2
8 u - 186 = 10 p --- (3)
(2) x 5
15 u - 340 = 10 p --- (4)
(4) = (3)
15 u - 340 = 8 u - 186
15 u - 8 u = 340 - 186
7 u = 154
1 u = 154 ÷ 7 = 22
Number of stickers that Adam has now
= 4 u - 93 + 3 u - 68
= 7 u - 161
= 7 x 22 - 161
= 154 - 161
= -7
Answer(s): -7