PSLE At first, Shiyun had 59 erasers and some buttons. After she gave away 15 erasers and 30% of the buttons, she had a total of 107 erasers and buttons. How many buttons did Shiyun have at first?
|
Erasers |
Buttons |
Total |
Before |
59 |
10 u |
|
Change |
- 15 |
- 3 u |
|
After |
44 |
7 u |
107 |
30% =
30100 =
310 Number of erasers that Shiyun left
= 59 - 15
= 44
Number of buttons that Shiyun left
= 107 - 44
= 63
7 u = 63
1 u = 63 ÷ 7 = 9
Number of buttons that Shiyun had at first
= 10 u
= 10 x 9
= 90
Answer(s): 90