The ratio of Simon's money to David's money is 1 : 5. If David has $150, how much must he give to Simon so both will have the equal amount of money?
|
Simon |
David |
Total |
Before |
1 u |
5 u |
6 u |
Change |
+ 2 u |
- 2 u |
|
After |
3 u |
3 u |
6 u |
Comparing Simon and David in the end |
1 |
1 |
|
Amount that David has at first = 5 u
5 u = 150
1 u = 150 ÷ 5 = 30
Total amount that David and Simon have
= 1 u + 5 u
= 6 u
Amount that each of them will have in the end
= 6 u ÷ 2
= 3 u
Amount that David must give to Simon
= 3 u - 1 u
= 2 u
= 2 x 30
= $60
Answer(s): $60