Adam and Bryan have $40.
Adam has 3 times as much money as Bryan.
How much must Adam give to Bryan
so Adam will have $10 less than Bryan?
|
Adam |
Bryan |
Total |
Before |
3 u |
1 u |
4 u |
Change |
- ? |
+ ? |
No change |
After |
$15 |
$15 + $10 |
$40 |
At first
Adam = 3 u
Bryan = 1 u
Total = 1 u + 3 u = 4 u
4 u = 40
1 u = 40 ÷ 4 = 10
Amount that Adam has at first
= 3 u
= 3 x 10
= $30
For Adam to have $10 less than Bryan in the end, we need to set aside $10 for Bryan before the remaining amount is divided into 2.
Amount that Adam will have in the end
= (40 - 10) ÷ 2
= 30 ÷ 2
= $15
Amount that Adam gives to Bryan
= Amount that Adam at first - Amount that Adam has in the end
= 30 - 15
= $15
Answer(s): $15