PSLE At first, Lucy had 94 buttons and some erasers. After she gave away 61 buttons and 60% of the erasers, she had a total of 39 buttons and erasers. How many erasers did Lucy have at first?
|
Buttons |
Erasers |
Total |
Before |
94 |
5 u |
|
Change |
- 61 |
- 3 u |
|
After |
33 |
2 u |
39 |
60% =
60100 =
35 Number of buttons that Lucy left
= 94 - 61
= 33
Number of erasers that Lucy left
= 39 - 33
= 6
2 u = 6
1 u = 6 ÷ 2 = 3
Number of erasers that Lucy had at first
= 5 u
= 5 x 3
= 15
Answer(s): 15