Question

The product of two rational numbers is -21/40. If one of them is 7/5, find other

Answer 1

Heyamate!!

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Let the other no. be x/y

$as \: \: per \: \: given \\ \frac{7}{5} \times \frac{x}{y} = - \frac{21}{40} \\ so \\ \frac{x}{y} = - \frac{21}{40} \times \frac{5}{7} \\ \frac{x}{y} = - \frac{3}{8}$

So the no. will be -3/8

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