PSLE At first, Opal had 55 stamps and some erasers. After she gave away 30 stamps and 25% of the erasers, she had a total of 31 stamps and erasers. How many erasers did Opal give away?
|
Stamps |
Erasers |
Total |
Before |
55 |
4 u |
|
Change |
- 30 |
- 1 u |
|
After |
25 |
3 u |
31 |
25% =
25100 =
14 Number of stamps that Opal left
= 55 - 30
= 25
Number of erasers that Opal left
= 31 - 25
= 6
3 u = 6
1 u = 6 ÷ 3 = 2
Number of erasers that Opal gave away
= 1 u
= 1 x 2
= 2
Answer(s): 2