PSLE Barbara had 69 bookmarks and Opal had 21 bookmarks. After Barbara gave some of her bookmarks to Opal, the number of bookmarks Barbara and Opal had was in the ratio 2 : 3. How many bookmarks did Opal have in the end?
|
Barbara |
Opal |
Total |
Before |
69 |
21 |
90 |
Change |
- ? |
+ ? |
|
After |
2 u |
3 u |
5 u |
Total number of bookmarks
= 69 + 21
= 90
Total number of bookmarks
= 2 u + 3 u
= 5 u
5 u = 90
1 u = 90 ÷ 5 = 18
Number of bookmarks that Opal had in the end
= 3 u
= 3 x 18
= 54
Answer(s): 54