PSLE At first, Shannon had 78 erasers and some marbles. After she gave away 56 erasers and 25% of the marbles, she had a total of 31 erasers and marbles. How many marbles did Shannon have at first?
|
Erasers |
Marbles |
Total |
Before |
78 |
4 u |
|
Change |
- 56 |
- 1 u |
|
After |
22 |
3 u |
31 |
25% =
25100 =
14 Number of erasers that Shannon left
= 78 - 56
= 22
Number of marbles that Shannon left
= 31 - 22
= 9
3 u = 9
1 u = 9 ÷ 3 = 3
Number of marbles that Shannon had at first
= 4 u
= 4 x 3
= 12
Answer(s): 12