The ratio of Elijah's stickers to Emma's stickers at first was 3 : 7. After Elijah gave Emma 60 stickers, the ratio of Elijah's stickers to Emma's stickers is 1 : 3. What was the number of stickers they had in all?
|
Elijah |
Emma |
Total |
Before |
3x4 = 12 u |
7x4 = 28 u
|
10x4 = 40 u |
Change |
- 60 |
+ 60 |
|
After |
1x10 = 10 u |
3x10 = 30 u |
4x10 = 40 u |
Number of stickers that Elijah gave Emma
= 12 u - 10 u
= 2 u
2 u = 60
1 u = 60 ÷ 2 = 30
Total number of stickers that they had
= 40 u
= 40 x 30
= 1200
Answer(s): 1200