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Elma · Answer 1 · 2021-10-05T21:56:16+0000

Answer:

$\frac12p+2 = 3\frac12$

Explanation:

The time he spends is the sum of the mandatory 2 hours and p times the half hour per puzzle. It has to end up to 3 1/2, so that's how you get the equation.

Of course, you can solve it as

$p = (1\frac12)/(\frac12) = 3$

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