The ratio of Peter's money to Tommy's money is 11 : 15. If Tommy has $420, how much must he give to Peter so both will have the equal amount of money?
| |
Peter |
Tommy |
Total |
| Before |
11 u |
15 u |
26 u |
| Change |
+ 2 u |
- 2 u |
|
| After |
13 u |
13 u |
26 u |
Comparing Peter and
Tommy in the end |
1 |
1 |
|
Amount that Tommy has at first = 15 u
15 u = 420
1 u = 420 ÷ 15 = 28
Total amount that Tommy and Peter have
= 11 u + 15 u
= 26 u
Amount that each of them will have in the end
= 26 u ÷ 2
= 13 u
Amount that Tommy must give to Peter
= 13 u - 11 u
= 2 u
= 2 x 28
= $56
Answer(s): $56
