The total cost of the laptop, the muffin maker and the water heater is $600. The water heater costs twice as much as the muffin maker. The laptop costs thrice as much as the total price of the water heater and muffin maker. How much less does the water heater cost than the laptop?
| Water Heater |
Muffin Maker |
Laptop |
| 2 u |
1 u |
|
| 3 u |
9 u |
| 2 u |
1 u |
9 u |
Cost of the muffin maker = 1 u
Cost of the water heater = 2 u
Total cost of the muffin maker and the water heater
= 1 u + 2 u
= 3 u
Cost of the laptop
= 3 x 3 u
= 9 u
Total cost of the water heater, the muffin maker and laptop
= 9 u + 1 u + 2 u
= 12 u
12 u = 600
1 u = 600 ÷ 12 = 50
Amount that the water heater cost less than the laptop
= 9 u - 2 u
= 7 u
= 7 x 50
= $350
Answer(s): $350
