PSLE Kathy had 57 bookmarks and Elyse had 33 bookmarks. After Kathy gave some of her bookmarks to Elyse, the number of bookmarks Kathy and Elyse had was in the ratio 2 : 4. How many bookmarks did Kathy have in the end?
|
Kathy |
Elyse |
Total |
Before |
57 |
33 |
90 |
Change |
- ? |
+ ? |
|
After |
2 u |
4 u |
6 u |
Total number of bookmarks
= 57 + 33
= 90
Total number of bookmarks
= 2 u + 4 u
= 6 u
6 u = 90
1 u = 90 ÷ 6 = 15
Number of bookmarks that Kathy had in the end
= 2 u
= 2 x 15
= 30
Answer(s): 30