The ratio of Owen's stickers to Sophia's stickers at first was 3 : 7. After Owen gave Sophia 10 stickers, the ratio of Owen's stickers to Sophia's stickers is 1 : 3. What was the number of stickers they had in total?
| |
Owen |
Sophia |
Total |
| Before |
3x4 =
12 u |
7x4 =
28 u
|
10x4 =
40 u |
| Change |
- 10 |
+ 10 |
|
| After |
1x10 =
10 u |
3x10 =
30 u |
4x10 =
40 u |
Number of stickers that Owen gave Sophia
= 12 u - 10 u
= 2 u
2 u = 10
1 u = 10 ÷ 2 = 5
Total number of stickers that they had
= 40 u
= 40 x 5
= 200
Answer(s): 200
