PSLE At first, Usha had 64 erasers and some pens. After she gave away 27 erasers and 40% of the pens, she had a total of 64 erasers and pens. How many pens did Usha give away?
|
Erasers |
Pens |
Total |
Before |
64 |
5 u |
|
Change |
- 27 |
- 2 u |
|
After |
37 |
3 u |
64 |
40% =
40100 =
25 Number of erasers that Usha left
= 64 - 27
= 37
Number of pens that Usha left
= 64 - 37
= 27
3 u = 27
1 u = 27 ÷ 3 = 9
Number of pens that Usha gave away
= 2 u
= 2 x 9
= 18
Answer(s): 18