Oliver had some erasers at first. After he bought another 57 erasers, he had four times as many erasers as before. How many erasers did Oliver have at first?
|
Erasers |
Before |
1 u |
Change |
+ 57 |
After |
1 u + 57 = 4 u |
Number of erasers after he bought = 1 u + 57
Number of erasers that is four times as many erasers as before = 4 x 1 u = 4 u
4 u = 1 u + 57
4 u - 1 u = 57
3 u = 57
1 u = 57 ÷ 3 = 19
Number of stickers that Kim had at first
= 1 u
= 19
Answer(s): 19