Question

what should be subtract from 5 by 7 to get 1 by 21​

Answer 1

Answer:

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Answer 2

Answer:

$\frac{2}{3 } \: is \: the \: answer$

Step-by-step explanation:

$according \: to \: the \: question \\ let \: the \: number \: be \: x \\ now \\ = \frac{5}{7} - x = \frac{1}{21} \\ = - x = \frac{1}{21} - \frac{5}{7} \\ = lcm \: of \: 21 \: and \: 7 \: is \: 21 \\ = - x = \frac{1 - 15}{21} \\ = - x = \frac{ - 14}{21} \\ = x = \frac{14}{21} \\ = x = \frac{2}{3}$

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