Luis had
49 as many erasers as Yoko. After Luis bought another 68 erasers, he had 17 less erasers than Yoko. How many erasers did Luis have at first?
|
Luis |
Yoko |
Before |
4 u |
9 u |
Change |
+ 68 |
|
After |
4 u + 68 |
9 u |
Yoko had 17 more erasers than Luis in the end. So, if Luis had another 17 erasers, he would have the same number of erasers as Yoko.
9 u = 4 u + 68 + 17
9 u - 4 u = 68 + 17
5 u = 85
1 u = 85 ÷ 5 = 17
Number of erasers that Luis had at first
= 4 u
= 4 x 17
= 68
Answer: 68