The total cost of the laptop, the deep fryer and the water heater is $1400. The water heater costs four times as much as the deep fryer. The laptop costs thrice as much as the total price of the water heater and deep fryer. How much less does the water heater cost than the laptop?
| Water Heater |
Deep Fryer |
Laptop |
| 4 u |
1 u |
|
| 5 u |
15 u |
| 4 u |
1 u |
15 u |
Cost of the deep fryer = 1 u
Cost of the water heater = 4 u
Total cost of the deep fryer and the water heater
= 1 u + 4 u
= 5 u
Cost of the laptop
= 3 x 5 u
= 15 u
Total cost of the water heater, the deep fryer and laptop
= 15 u + 1 u + 4 u
= 20 u
20 u = 1400
1 u = 1400 ÷ 20 = 70
Amount that the water heater cost less than the laptop
= 15 u - 4 u
= 11 u
= 11 x 70
= $770
Answer(s): $770
