PSLE Mary had 72 paperclips and Tina had 18 paperclips. After Mary gave some of her paperclips to Tina, the number of paperclips Mary and Tina had was in the ratio 2 : 3. How many paperclips did Mary have in the end?
|
Mary |
Tina |
Total |
Before |
72 |
18 |
90 |
Change |
- ? |
+ ? |
|
After |
2 u |
3 u |
5 u |
Total number of paperclips
= 72 + 18
= 90
Total number of paperclips
= 2 u + 3 u
= 5 u
5 u = 90
1 u = 90 ÷ 5 = 18
Number of paperclips that Mary had in the end
= 2 u
= 2 x 18
= 36
Answer(s): 36