The total cost of the refrigerator, the water heater and the muffin maker is $840. The muffin maker costs twice as much as the water heater. The refrigerator costs thrice as much as the total price of the muffin maker and water heater. How much more does the muffin maker cost than the refrigerator?
| Muffin Maker |
Water Heater |
Refrigerator |
| 2 u |
1 u |
|
| 3 u |
9 u |
| 2 u |
1 u |
9 u |
Cost of the water heater = 1 u
Cost of the muffin maker = 2 u
Total cost of the water heater and the muffin maker
= 1 u + 2 u
= 3 u
Cost of the refrigerator
= 3 x 3 u
= 9 u
Total cost of the muffin maker, the water heater and refrigerator
= 9 u + 1 u + 2 u
= 12 u
12 u = 840
1 u = 840 ÷ 12 = 70
Amount that the refrigerator cost more than the muffin maker
= 9 u - 2 u
= 7 u
= 7 x 70
= $490
Answer(s): $490
