The ratio of Elizabeth's stickers to Scarlett's stickers at first was 2 : 5. After Elizabeth gave Scarlett 21 stickers, the ratio of Elizabeth's stickers to Scarlett's stickers is 1 : 4. What was the number of stickers they had in total?
|
Elizabeth |
Scarlett |
Total |
Before |
2x5 = 10 u |
5x5 = 25 u
|
7x5 = 35 u |
Change |
- 21 |
+ 21 |
|
After |
1x7 = 7 u |
4x7 = 28 u |
5x7 = 35 u |
Number of stickers that Elizabeth gave Scarlett
= 10 u - 7 u
= 3 u
3 u = 21
1 u = 21 ÷ 3 = 7
Total number of stickers that they had
= 35 u
= 35 x 7
= 245
Answer(s): 245