Let x and y be two-digit positive integers with average (arithmetic mean) 60. What is the maximum value of the ratio x/y?

Correct answer marked below

33/7

Correct

39/7

99/10

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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.