4 computers and 2 notebooks cost a total of $1430. Each computer costs twice as much as each notebook.
- What is the cost of each computer?
- What is the total cost of 1 computer and 1 notebook?
(a)
Cost of 1 notebook = 1 u
Cost of 1 computer = 2 x 1 u = 2 u
Cost of 2 notebooks = 2 x 1 u = 2 u
Cost of 4 computers = 4 x 2 u = 8 u
Total cost of 4 computers and 2 notebooks
= 8 u + 2 u
= 10 u
10 u = 1430
1 u = 1430 ÷ 10 = 143
Cost of each computer
= 2 u
= 2 x 143
= $286
(b)
Total cost of 1 computer and 1 notebook
= 2 u + 1 u
= 3 u
= 3 x 143
= $429
Answer(s): (a) $286; (b) $429
