Yesterday, Ethan had 20 more erasers than Carl. Today, Ethan gave Carl
47 of his erasers. As a result, he has half as many erasers as Carl now. How many erasers did Ethan have yesterday?
|
Ethan |
Carl |
More |
Before |
7 u |
2 u |
5 u |
Change |
- 4 u |
+ 4 u |
|
After |
3 u |
6 u |
|
Comparing Ethan and Carl in the end |
1
|
2
|
|
Number of erasers that Carl has now
= 2 x 3 u
= 6 u
Number of erasers that Ethan had more than Carl yesterday
= 7 u - 2 u
= 5 u
5 u = 20
1 u = 20 ÷ 5 = 4
Number of erasers that Ethan had yesterday
= 7 u
= 7 x 4
= 28
Answer(s): 28