The total cost of the laptop, the juicer and the lamp is $960. The lamp costs twice as much as the juicer. The laptop costs thrice as much as the total price of the lamp and juicer. How much less does the lamp cost than the laptop?
| Lamp |
Juicer |
Laptop |
| 2 u |
1 u |
|
| 3 u |
9 u |
| 2 u |
1 u |
9 u |
Cost of the juicer = 1 u
Cost of the lamp = 2 u
Total cost of the juicer and the lamp
= 1 u + 2 u
= 3 u
Cost of the laptop
= 3 x 3 u
= 9 u
Total cost of the lamp, the juicer and laptop
= 9 u + 1 u + 2 u
= 12 u
12 u = 960
1 u = 960 ÷ 12 = 80
Amount that the lamp cost less than the laptop
= 9 u - 2 u
= 7 u
= 7 x 80
= $560
Answer(s): $560
