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Question
Express `4/7` as a rational number with numerator: −20
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Solution
Given the current numerator is 4, and we want the numerator to become −20, the scaling factor is:
Scaling factor = `(-20)/4 = -5`
Multiply both the numerator and denominator of `4/7` by −5:
`4/7 = (4xx(-5))/(7xx(-5)) = (-20)/-35`
The negative signs in both numerator and denominator cancel out:
`(-20)/-35 = (-20)/35`
`=(-20)/35`
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