4 refrigerators and 2 portable air-conditioners cost a total of $1320. Each refrigerator costs twice as much as each portable air-conditioner.
- What is the cost of each refrigerator?
- What is the total cost of 1 refrigerator and 1 portable air-conditioner?
(a)
Cost of 1 portable air-conditioner = 1 u
Cost of 1 refrigerator = 2 x 1 u = 2 u
Cost of 2 portable air-conditioners = 2 x 1 u = 2 u
Cost of 4 refrigerators = 4 x 2 u = 8 u
Total cost of 4 refrigerators and 2 portable air-conditioners
= 8 u + 2 u
= 10 u
10 u = 1320
1 u = 1320 ÷ 10 = 132
Cost of each refrigerator
= 2 u
= 2 x 132
= $264
(b)
Total cost of 1 refrigerator and 1 portable air-conditioner
= 2 u + 1 u
= 3 u
= 3 x 132
= $396
Answer(s): (a) $264; (b) $396
