PSLE At first, Risa had 93 erasers and some pens. After she gave away 64 erasers and 25% of the pens, she had a total of 38 erasers and pens. How many pens did Risa give away?
|
Erasers |
Pens |
Total |
Before |
93 |
4 u |
|
Change |
- 64 |
- 1 u |
|
After |
29 |
3 u |
38 |
25% =
25100 =
14 Number of erasers that Risa left
= 93 - 64
= 29
Number of pens that Risa left
= 38 - 29
= 9
3 u = 9
1 u = 9 ÷ 3 = 3
Number of pens that Risa gave away
= 1 u
= 1 x 3
= 3
Answer(s): 3