Eva had 20 more wafers than Cathy at first. After Eva ate 4 wafers, she had five times as many wafers as Cathy in the end. How many wafers did Cathy have?
| |
Cathy |
Eva |
| Before |
1 u |
1 u + 20 |
| Change |
|
- 4 |
| After |
1 u |
1 u + 16 |
Comparing Cathy
and Eva in the end |
1 u |
5 u |
The number of wafers that Cathy had remains unchanged.
Number of wafers that Eva had in the end
= 5 x 1 u
= 5 u
5 u = 1 u + 16
5 u - 1 u = 16
4 u = 16
1 u = 16 ÷ 4 = 4
Number of wafers that Cathy had
= 1 u
= 4
Answer(s): 4
