PSLE Vanessa had 69 post-it notes and Emily had 21 post-it notes. After Vanessa gave some of her post-it notes to Emily, the number of post-it notes Vanessa and Emily had was in the ratio 4 : 5. How many post-it notes did Emily have in the end?
|
Vanessa |
Emily |
Total |
Before |
69 |
21 |
90 |
Change |
- ? |
+ ? |
|
After |
4 u |
5 u |
9 u |
Total number of post-it notes
= 69 + 21
= 90
Total number of post-it notes
= 4 u + 5 u
= 9 u
9 u = 90
1 u = 90 ÷ 9 = 10
Number of post-it notes that Emily had in the end
= 5 u
= 5 x 10
= 50
Answer(s): 50