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What are the important variables in the problem below?

A test is worth 50 points. Multiple-choice questions are worth 1 point, and short-answer questions are worth 3 points. If the test has 20 questions, how many multiple-choice questions are there?

1 answer

multi-choice --- x
shorts - ----- 20-x

x + 3(20-x) = 50
carry 0n

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