2 laptops and 4 notebooks cost a total of $1712. Each laptop costs twice as much as each notebook.
- What is the cost of each laptop?
- What is the total cost of 1 laptop and 1 notebook?
(a)
Cost of 1 notebook = 1 u
Cost of 1 laptop = 2 x 1 u = 2 u
Cost of 4 notebooks = 4 x 1 u = 4 u
Cost of 2 laptops = 2 x 2 u = 4 u
Total cost of 2 laptops and 4 notebooks
= 4 u + 4 u
= 8 u
8 u = 1712
1 u = 1712 ÷ 8 = 214
Cost of each laptop
= 2 u
= 2 x 214
= $428
(b)
Total cost of 1 laptop and 1 notebook
= 2 u + 1 u
= 3 u
= 3 x 214
= $642
Answer(s): (a) $428; (b) $642
