PSLE Diana had 49 post-it notes and Shiyun had 32 post-it notes. After Diana gave some of her post-it notes to Shiyun, the number of post-it notes Diana and Shiyun had was in the ratio 4 : 5. How many post-it notes did Shiyun have in the end?
|
Diana |
Shiyun |
Total |
Before |
49 |
32 |
81 |
Change |
- ? |
+ ? |
|
After |
4 u |
5 u |
9 u |
Total number of post-it notes
= 49 + 32
= 81
Total number of post-it notes
= 4 u + 5 u
= 9 u
9 u = 81
1 u = 81 ÷ 9 = 9
Number of post-it notes that Shiyun had in the end
= 5 u
= 5 x 9
= 45
Answer(s): 45