The total cost of the refrigerator, the toaster and the lamp is $600. The lamp costs four times as much as the toaster. The refrigerator costs twice as much as the total price of the lamp and toaster. How much less does the lamp cost than the refrigerator?
| Lamp |
Toaster |
Refrigerator |
| 4 u |
1 u |
|
| 5 u |
10 u |
| 4 u |
1 u |
10 u |
Cost of the toaster = 1 u
Cost of the lamp = 4 u
Total cost of the toaster and the lamp
= 1 u + 4 u
= 5 u
Cost of the refrigerator
= 2 x 5 u
= 10 u
Total cost of the lamp, the toaster and refrigerator
= 10 u + 1 u + 4 u
= 15 u
15 u = 600
1 u = 600 ÷ 15 = 40
Amount that the lamp cost less than the refrigerator
= 10 u - 4 u
= 6 u
= 6 x 40
= $240
Answer(s): $240
