The multiplying ratio which changes Rs $90$ into Rs $63$ is ____

5 : 9

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3 : 4

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6 : 8

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7 : 10

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Solution

The correct option is D $7 : 10$
Final quantity $= 63$
Original quantity $= 90$
Multiplying ratio
$\frac{Final quantities}{Original quantity} = \frac{63}{90} = \frac{7}{10}$

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