24% of the books on David's shelf are mysteries. There are 36 mysteries on the shelf.

1 answer:

5 0

$\frac{24}{100} = \frac{36}{x} \\ x = \frac{36 \times 100}{24} = \frac{3600}{24} = 150$
there are 150 books on the shelf

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$x=\sqrt{880-8x}\\
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