Adam and Bryan have $20.
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 |
$5 |
$5 + $10 |
$20 |
At first
Adam = 3 u
Bryan = 1 u
Total = 1 u + 3 u = 4 u
4 u = 20
1 u = 20 ÷ 4 = 5
Amount that Adam has at first
= 3 u
= 3 x 5
= $15
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
= (20 - 10) ÷ 2
= 10 ÷ 2
= $5
Amount that Adam gives to Bryan
= Amount that Adam at first - Amount that Adam has in the end
= 15 - 5
= $10
Answer(s): $10