Billy, Cody, Albert and Luis bought a notebook for their aunt. Billy paid
13 of what the rest paid. Cody paid
15 of what the rest paid. Albert paid
16 of what the rest paid. Luis paid $96 more than Billy. How much did the notebook cost?
Billy |
Cody |
Albert |
Luis |
Total |
1x21 |
|
|
|
4x21 |
|
1x14 |
|
|
6x14 |
|
|
1x12 |
|
7x12 |
21 u |
14 u |
12 u |
37 u |
84 u |
The cost of the notebook is repeated. Make the cost of the notebook the same. LCM of 4, 6 and 7 is 84.
Amount that Luis had
= 84 u - (21 u + 14 u + 12 u)
= 37 u
Amount that Luis paid more than Billy
= 37 u - 21 u
= 16 u
16 u = 96
1 u = 96 ÷ 16 = 6
Cost of the notebook
= 84 u
= 84 x 6
= $504
Answer(s): $504