Kathy had 19 more wafers than Wendy at first. After Kathy ate 5 wafers, she had thrice as many wafers as Wendy in the end. How many wafers did Wendy have?
| |
Wendy |
Kathy |
| Before |
1 u |
1 u + 19 |
| Change |
|
- 5 |
| After |
1 u |
1 u + 14 |
Comparing Wendy
and Kathy in the end |
1 u |
3 u |
The number of wafers that Wendy had remains unchanged.
Number of wafers that Kathy had in the end
= 3 x 1 u
= 3 u
3 u = 1 u + 14
3 u - 1 u = 14
2 u = 14
1 u = 14 ÷ 2 = 7
Number of wafers that Wendy had
= 1 u
= 7
Answer(s): 7
