Michael had
310 as many erasers as Ivory. After Michael bought another 118 erasers, he had 15 less erasers than Ivory. How many erasers did Michael have at first?
| |
Michael |
Ivory |
| Before |
3 u |
10 u |
| Change |
+ 118 |
|
| After |
3 u + 118 |
10 u |
Ivory had 15 more erasers than Michael in the end. So, if Michael had another 15 erasers, he would have the same number of erasers as Ivory.
10 u = 3 u + 118 + 15
10 u - 3 u = 118 + 15
7 u = 133
1 u = 133 ÷ 7 = 19
Number of erasers that Michael had at first
= 3 u
= 3 x 19
= 57
Answer: 57
