Bobby had
35 as many erasers as Yen. After Bobby bought another 3 erasers, he had 11 less erasers than Yen. How many erasers did Bobby have at first?
| |
Bobby |
Yen |
| Before |
3 u |
5 u |
| Change |
+ 3 |
|
| After |
3 u + 3 |
5 u |
Yen had 11 more erasers than Bobby in the end. So, if Bobby had another 11 erasers, he would have the same number of erasers as Yen.
5 u = 3 u + 3 + 11
5 u - 3 u = 3 + 11
2 u = 14
1 u = 14 ÷ 2 = 7
Number of erasers that Bobby had at first
= 3 u
= 3 x 7
= 21
Answer: 21
