3 cousins, Barbara, Penelope and Lucy, paid a total of $42 for a present. Barbara paid
13 of what the others paid. Penelope paid
16 of what the others paid. How much did Lucy pay?
| Barbara |
Lucy |
Penelope |
Total |
| 1x7 |
3x7 |
4x7 |
| 6x4 |
1x4 |
7x4 |
| 7 u |
17 u |
4 u |
28 u |
Total cost of the present = 28 u
28 u = 42
1 u = 42 ÷ 28 = 1.50
Amount that Lucy paid
= 28 u - 7 u - 4 u
= 17 u
= 17 x 1.50
= $25.50
Answer: $25.50
