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How many ☐ symbols are in the figure?

$24$
$20$
$15$
$17$
$25$

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A number or a short expression. Fractions can be typed as 3/2, and spacing doesn't matter.

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Official solution

The figure includes 5 groups of 5 squares.

Thus, there are $5 \times 5 = 25$ squares in total.

Source: CEMC, University of Waterloo, licensed CC-BY-NC-4.0. Statement reproduced verbatim; metadata (topic, difficulty, ordering) added by this project.