4 notebooks and 3 computers cost a total of $2211. Each notebook costs twice as much as each computer.
- What is the cost of each notebook?
- What is the total cost of 1 notebook and 1 computer?
(a)
Cost of 1 computer = 1 u
Cost of 1 notebook = 2 x 1 u = 2 u
Cost of 3 computers = 3 x 1 u = 3 u
Cost of 4 notebooks = 4 x 2 u = 8 u
Total cost of 4 notebooks and 3 computers
= 8 u + 3 u
= 11 u
11 u = 2211
1 u = 2211 ÷ 11 = 201
Cost of each notebook
= 2 u
= 2 x 201
= $402
(b)
Total cost of 1 notebook and 1 computer
= 2 u + 1 u
= 3 u
= 3 x 201
= $603
Answer(s): (a) $402; (b) $603