AlgebraVery hardFinding where two linear models cross
Algebra practice question
Company A's cost to print n flyers is 40 + 0.05n dollars. Company B's is 10 + 0.11n dollars. For what number of flyers do the two companies charge the same?
Answer: 500
40 + 0.05n = 10 + 0.11n gives 30 = 0.06n, n = 500.
Common wrong answers
- If you answered 50
- 50 is 30 divided by 0.6, a decimal slip.
- If you answered 300
- 300 comes from 30/0.10 (adding the rates instead of subtracting).
- If you answered 600
- 600 comes from 30/0.05, using only A's rate.
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