2 washing machines and 5 computers cost a total of $1980. Each washing machine costs thrice as much as each computer.
- What is the cost of each washing machine?
- What is the total cost of 1 washing machine and 1 computer?
(a)
Cost of 1 computer = 1 u
Cost of 1 washing machine = 3 x 1 u = 3 u
Cost of 5 computers = 5 x 1 u = 5 u
Cost of 2 washing machines = 2 x 3 u = 6 u
Total cost of 2 washing machines and 5 computers
= 6 u + 5 u
= 11 u
11 u = 1980
1 u = 1980 ÷ 11 = 180
Cost of each washing machine
= 3 u
= 3 x 180
= $540
(b)
Total cost of 1 washing machine and 1 computer
= 3 u + 1 u
= 4 u
= 4 x 180
= $720
Answer(s): (a) $540; (b) $720