John, Sean, Seth and Henry bought a computer for their aunt. John paid
13 of what the rest paid. Sean paid
14 of what the rest paid. Seth paid
15 of what the rest paid. Henry paid $72 more than John. How much did the computer cost?
John |
Sean |
Seth |
Henry |
Total |
1x15 |
|
|
|
4x15 |
|
1x12 |
|
|
5x12 |
|
|
1x10 |
|
6x10 |
15 u |
12 u |
10 u |
23 u |
60 u |
The cost of the computer is repeated. Make the cost of the computer the same. LCM of 4, 5 and 6 is 60.
Amount that Henry had
= 60 u - (15 u + 12 u + 10 u)
= 23 u
Amount that Henry paid more than John
= 23 u - 15 u
= 8 u
8 u = 72
1 u = 72 ÷ 8 = 9
Cost of the computer
= 60 u
= 60 x 9
= $540
Answer(s): $540