Yesterday, Tommy had 4 more erasers than Jack. Today, Tommy gave Jack
37 of his erasers. As a result, he has half as many erasers as Jack now. How many erasers did Tommy have yesterday?
| |
Tommy |
Jack |
More |
| Before |
7 u |
5 u |
2 u |
| Change |
- 3 u |
+ 3 u |
|
| After |
4 u |
8 u |
|
Comparing Tommy and
Jack in the end |
1
|
2
|
|
Number of erasers that Jack has now
= 2 x 4 u
= 8 u
Number of erasers that Tommy had more than Jack yesterday
= 7 u - 5 u
= 2 u
2 u = 4
1 u = 4 ÷ 2 = 2
Number of erasers that Tommy had yesterday
= 7 u
= 7 x 2
= 14
Answer(s): 14
