Ken had
38 as many erasers as Yen. After Ken bought another 8 erasers, he had 17 less erasers than Yen. How many erasers did Ken have at first?
|
Ken |
Yen |
Before |
3 u |
8 u |
Change |
+ 8 |
|
After |
3 u + 8 |
8 u |
Yen had 17 more erasers than Ken in the end. So, if Ken had another 17 erasers, he would have the same number of erasers as Yen.
8 u = 3 u + 8 + 17
8 u - 3 u = 8 + 17
5 u = 25
1 u = 25 ÷ 5 = 5
Number of erasers that Ken had at first
= 3 u
= 3 x 5
= 15
Answer: 15