The ratio of Audrey's stickers to Owen's stickers at first was 2 : 5. After Audrey gave Owen 72 stickers, the ratio of Audrey's stickers to Owen's stickers is 1 : 4. What was the number of stickers they had in all?
|
Audrey |
Owen |
Total |
Before |
2x5 = 10 u |
5x5 = 25 u
|
7x5 = 35 u |
Change |
- 72 |
+ 72 |
|
After |
1x7 = 7 u |
4x7 = 28 u |
5x7 = 35 u |
Number of stickers that Audrey gave Owen
= 10 u - 7 u
= 3 u
3 u = 72
1 u = 72 ÷ 3 = 24
Total number of stickers that they had
= 35 u
= 35 x 24
= 840
Answer(s): 840