The cost of 40 pens, 44 pencils and 50 Erasers is $392. The cost of 46 pens, 54 pencils and 60 erasers is $466. If the cost of 109 pens, 125 pencils and 140 Erasers is $N, find N.

Correct answer marked below

545.5

1091

Correct

2182

2800

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What this question tests

Your ability to manipulate linear and quadratic expressions, substitute unknowns, and solve equations under time pressure.

Losing a sign when moving terms across the equals sign, or dividing both sides by a variable that could equal zero.