The ratio of Amelia's stickers to Avery's stickers at first was 3 : 7. After Amelia gave Avery 45 stickers, the ratio of Amelia's stickers to Avery's stickers is 1 : 4. What was the number of stickers they had in all?
|
Amelia |
Avery |
Total |
Before |
3x5 = 15 u |
7x5 = 35 u
|
10x5 = 50 u |
Change |
- 45 |
+ 45 |
|
After |
1x10 = 10 u |
4x10 = 40 u |
5x10 = 50 u |
Number of stickers that Amelia gave Avery
= 15 u - 10 u
= 5 u
5 u = 45
1 u = 45 ÷ 5 = 9
Total number of stickers that they had
= 50 u
= 50 x 9
= 450
Answer(s): 450