?

Can you find a number...

...whose double exceeds its quarter by 7.

Puzzle Copyright © Kevin Stone

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Answer

4.

4's double is 8, and 4's quarter is 1.

Reasoning

If the missing number is N, then:

2N = N + 7

—

4

Multiply throughout by 4:

8N = N + 28

Subtract N from both sides:

7N = 28

Divide throughout by 7:

N = 4

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