Mary had 10 more muffins than Kathy at first. After Mary ate 4 muffins, she had four times as many muffins as Kathy in the end. How many muffins did Kathy have?
| |
Kathy |
Mary |
| Before |
1 u |
1 u + 10 |
| Change |
|
- 4 |
| After |
1 u |
1 u + 6 |
Comparing Kathy
and Mary in the end |
1 u |
4 u |
The number of muffins that Kathy had remains unchanged.
Number of muffins that Mary had in the end
= 4 x 1 u
= 4 u
4 u = 1 u + 6
4 u - 1 u = 6
3 u = 6
1 u = 6 ÷ 3 = 2
Number of muffins that Kathy had
= 1 u
= 2
Answer(s): 2
