After decreasing $60$ in the ratio $3 : 4$ we get?

45

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50

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40

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60

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Solution

The correct option is A $45$
$3 : 4$ is the ratio of the new quantity to the original quantity.
Let the new number be x.
$∴ \frac{x}{60} = \frac{3}{4}$
$∴ x = 45$
$∴$ The decreased quantity is $45$

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