John had $128 and his sister had $12 at first. After they received an equal amount of allowance, John had five times as much money as his sister. How much allowance did each of them receive?
| |
John |
His sister |
Difference |
| Before |
$128 |
$12 |
$116 |
| Change |
+ ? |
+ ? |
|
| After |
5 u |
1 u |
4 u |
The difference in the amounts between John and his sister at first and in the end remains unchanged after each received an equal amount of allowance.
Difference in the amounts between Perry and his sister
= 5 u - 1 u
= 4 u
4 u = 128 - 12
4 u = 116
1 u = 116 ÷ 4 = 29
Allowance that each of them received
= 1 u - 12
= 29 - 12
= $17
Answer(s): $17
