The ratio of Anthony's stickers to Bryan's stickers at first was 3 : 7. After Anthony gave Bryan 72 stickers, the ratio of Anthony's stickers to Bryan's stickers is 1 : 3. What was the number of stickers they had altogether?
|
Anthony |
Bryan |
Total |
Before |
3x4 = 12 u |
7x4 = 28 u
|
10x4 = 40 u |
Change |
- 72 |
+ 72 |
|
After |
1x10 = 10 u |
3x10 = 30 u |
4x10 = 40 u |
Number of stickers that Anthony gave Bryan
= 12 u - 10 u
= 2 u
2 u = 72
1 u = 72 ÷ 2 = 36
Total number of stickers that they had
= 40 u
= 40 x 36
= 1440
Answer(s): 1440