Zoe had $21 less than Emily at first. After Emily and Zoe spent an equal amount of money, Zoe had
710 as much as Emily. How much money did Zoe have left?
| |
Zoe |
Emily |
Difference |
| Before |
1 u |
1 u + $21 |
$21 |
| Change |
- 1 |
- 1 |
|
| After |
7 p |
10 p |
3 p |
Difference in the amounts between Emily and Zoe
= 10 p - 7 p
= 3 p
Since both Emily and Zoe spent an equal amount, the difference in the amounts that Emily and Zoe had at first and in the end remains unchanged.
3 p = 21
1 p = 21 ÷ 3 = 7
Amount that Zoe had left
= 7 p
= 7 x 7
= $49
Answer(s): $49
