Can you find a number...
...whose double exceeds its quarter by 7.
Puzzle Copyright © Kevin Stone
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The number is less than 100.
4's double is 8 and 4's quarter is 1.
If the missing number is N, then:
2N = N + 7
Multiply throughout by 4:
8N = N + 28
Subtract N from both sides:
7N = 28
Divide throughout by 7:
N = 4
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