3 laptops and 4 washing machines cost a total of $3000. Each laptop costs twice as much as each washing machine.
- What is the cost of each laptop?
- What is the total cost of 1 laptop and 1 washing machine?
(a)
Cost of 1 washing machine = 1 u
Cost of 1 laptop = 2 x 1 u = 2 u
Cost of 4 washing machines = 4 x 1 u = 4 u
Cost of 3 laptops = 3 x 2 u = 6 u
Total cost of 3 laptops and 4 washing machines
= 6 u + 4 u
= 10 u
10 u = 3000
1 u = 3000 ÷ 10 = 300
Cost of each laptop
= 2 u
= 2 x 300
= $600
(b)
Total cost of 1 laptop and 1 washing machine
= 2 u + 1 u
= 3 u
= 3 x 300
= $900
Answer(s): (a) $600; (b) $900
