The total cost of the portable air-conditioner, the blender and the lamp is $240. The lamp costs twice as much as the blender. The portable air-conditioner costs thrice as much as the total price of the lamp and blender. How much more does the lamp cost than the portable air-conditioner?
| Lamp |
Blender |
Portable Air-conditioner |
| 2 u |
1 u |
|
| 3 u |
9 u |
| 2 u |
1 u |
9 u |
Cost of the blender = 1 u
Cost of the lamp = 2 u
Total cost of the blender and the lamp
= 1 u + 2 u
= 3 u
Cost of the portable air-conditioner
= 3 x 3 u
= 9 u
Total cost of the lamp, the blender and portable air-conditioner
= 9 u + 1 u + 2 u
= 12 u
12 u = 240
1 u = 240 ÷ 12 = 20
Amount that the portable air-conditioner cost more than the lamp
= 9 u - 2 u
= 7 u
= 7 x 20
= $140
Answer(s): $140
