Question
Fill in the place holders:
$\frac{5}{7}=\frac{\Box}{28}=\frac{35}{\Box}$

Answer

$\frac{5}{7}=\frac{20}{28}=\frac{35}{49}$
Solution:
$\frac{5}{7}=\frac{\Box}{28}$
$\because28=7\times4$
$\therefore\frac{5}{7}=\frac{5\times4}{7\times4}=\frac{20}{28}$
$\text{and }\frac{5}{7}=\frac{35}{\Box}$
$\because35=5\times7$
$\frac{5}{7}=\frac{5\times7}{7\times7}=\frac{35}{49}$
$\therefore\frac{5}{7}=\frac{20}{28}=\frac{35}{49}$

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