On a ten question math test, each correct answer is worth 5 points, each unanswered question is worth 1 point, and each incorrect answer is worth 0 points. What scores greater than 40 are not possible to achieve?
the score is 5x+y where x is correct answers y is unanswered questions,
x = 8, y = 0, 1 or 2, score = 40, 41, 42
x = 9, y = 0, 1 score = 45, 46
x = 10, y=0 score = 50
obvious score > 50 are impossible,
43, 44, 47,48,49 are also not possible
thank you! that was really helpful!
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