Barbara had four times as much money as Mary. After Barbara spent $14 and Mary spent $7, Barbara had $20 more than Mary. How much did Barbara have in the end?
| |
Barbara |
Mary |
| Before |
4 u |
1 u |
| Change |
- $14 |
- $7 |
| After |
4 u - $14 |
1 u - $7 |
Comparing Barbara
and Mary
in the end |
$20 more |
|
If Mary was given another $20, the amounts that Barbara and Mary each had in the end would be the same.
4 u - 14 = 1 u - 7 + 20
4 u - 1 u = 14 + 13
3 u = 27
1 u = 27 ÷ 3 = 9
Amount that Barbara had in the end
= 4 u - 14
= 4 x 9 - 14
= 36 - 14
= $22
Answer(s): $22
