Question
Replace $\square$ by the correct number: $\frac{45}{60}=\frac{15}{\square}$

Answer

$ \frac{45}{60}=\frac{15}{a} $
$\therefore 45 \times a = 60 \times 15$
$\therefore a = \frac{60 \times 15}{45}=\frac{900}{45} $
$\therefore a = 20$
$\therefore \frac{45}{60}=\frac{15}{20}$

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