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प्रश्न
By what numbers should we multiply `(-15)/20` so that the product may be `(-5)/7`?
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उत्तर
Let the required number be x.
According to the question,
`x xx (-15)/20 = (-5)/7`
`x = (-5)/7 xx 20/(-15) = 20/21`
Hence, the required number is `20/21`.
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