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A math test is worth 100 points and has 30 problems. Each problem is worth either three points or four points. How many four Problems are there?
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A math test is worth 100 points and has 30 problems. Each problem is worth either three points or four points. How many four Problems are there?

User Rushino
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If all were 3-point problems, the test would be worth 90. In order to add 10 points to the value, 10 4-point problems are needed.
User Ianace
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