Find
$3. 6 : 0.4 = x : 0.5$

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Solution

b'
$3.6 : 0.4 = x : 0.5$
$3.6 \times 10 : 0.4 \times 10 = x \times 10 : 0.5 \times 10$ multiply both sides by $10$
$36 : 4 = x : 5$
$\Rightarrow \frac{36}{4} = \frac{x}{5}$
$\Rightarrow \frac{x}{5} = 9$
$∴ x = 9 \times 5 = 45$
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