The ratio of the number of red stickers to blue stickers is 6 : 1.
After Adam buys another 39 blue stickers and gives away 27 red stickers,
the ratio becomes of the number of red stickers to blue stickers is 9 : 2.
How many stickers does Adam have now?
|
Make p the same (1) x 2 = (3) |
(1) Red |
(2) Blue |
Make p the same (2) x 9 = (4) |
Before |
12 u |
6 u |
1 u |
9 u |
Change |
- 54 |
- 27 |
+ 39 |
+ 351 |
After |
18 p |
9 p |
2 p |
18 p |
6 u + 39 = 9 p --- (1)
1 u - 27 = 2 p --- (2)
Make p the same.
(1)
x 212 u - 54 = 18 p --- (3)
(2)
x 99 u + 351 = 18 p --- (4)
(3) = (4)
12 u - 54 = 9 u + 351
12 u - 9 u = 54 + 351
3 u = 405
1 u = 405 ÷ 3 = 135
Number of stickers that Adam have now
= 6 u + 39 + 1 u - 27
= 6 u + 1 u + 39 - 27
= 7 u + 12
= 7 x 135 + 12
= 945 + 12
= 957
Answer(s): 957