PSLE At first, Shiyun had 99 stamps and some erasers. After she gave away 77 stamps and 30% of the erasers, she had a total of 78 stamps and erasers. How many erasers did Shiyun give away?
|
Stamps |
Erasers |
Total |
Before |
99 |
10 u |
|
Change |
- 77 |
- 3 u |
|
After |
22 |
7 u |
78 |
30% =
30100 =
310 Number of stamps that Shiyun left
= 99 - 77
= 22
Number of erasers that Shiyun left
= 78 - 22
= 56
7 u = 56
1 u = 56 ÷ 7 = 8
Number of erasers that Shiyun gave away
= 3 u
= 3 x 8
= 24
Answer(s): 24