Question

Mr. Rao buus a computer, a printer and a scanner for $2543. The computer costs $1502 more than the printer. The printer costs $123 more than the scanner. How much does Mrs. Rao pay for the computer?

Answer 1

1) total $ = 2543
2) x -> printer y-> computer z -> scanner
3) y = x + 1502
4) x = z + 123 -> x - 123 = z
5) 2543 = (x + 1502) + (x - 123) + x
6) 2543 = x + 1502 + x - 123 + x
7) 2543 = 3x + 1379
8) 2543 - 1379 = 3x
9) x = 388$
10) y = x + 1502
11) y = 1890$

computer costs 1890$