Oscar had
710 as many erasers as Hazel. After Oscar bought another 47 erasers, he had 13 less erasers than Hazel. How many erasers did Oscar have at first?
| |
Oscar |
Hazel |
| Before |
7 u |
10 u |
| Change |
+ 47 |
|
| After |
7 u + 47 |
10 u |
Hazel had 13 more erasers than Oscar in the end. So, if Oscar had another 13 erasers, he would have the same number of erasers as Hazel.
10 u = 7 u + 47 + 13
10 u - 7 u = 47 + 13
3 u = 60
1 u = 60 ÷ 3 = 20
Number of erasers that Oscar had at first
= 7 u
= 7 x 20
= 140
Answer: 140
