Bryan and Adam have $30.
Bryan has 2 times as much money as Adam.
How much must Bryan give to Adam
so Bryan will have $20 less than Adam?
|
Bryan |
Adam |
Total |
Before |
2 u |
1 u |
3 u |
Change |
- ? |
+ ? |
No change |
After |
$5 |
$5 + $20 |
$30 |
At first
Bryan = 2 u
Adam = 1 u
Total = 1 u + 2 u = 3 u
3 u = 30
1 u = 30 ÷ 3 = 10
Amount that Bryan has at first
= 2 u
= 2 x 10
= $20
For Bryan to have $20 less than Adam in the end, we need to set aside $20 for Adam before the remaining amount is divided into 2.
Amount that Bryan will have in the end
= (30 - 20) ÷ 2
= 10 ÷ 2
= $5
Amount that Bryan gives to Adam
= Amount that Bryan at first - Amount that Bryan has in the end
= 20 - 5
= $15
Answer(s): $15