In each of the following cases, write the rational number whose numerator and denominator are respectively as under:
$25 + 15$ and $81 \div 40$

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Solution

$25 + 15$ and $81 \div 40$
Let numerator $p = 25 + 15 = 40$
Denominator $q = 81 \div 40 = \frac{81}{40}$

Hence,rational number, $\frac{p}{q} = \frac{40}{\frac{81}{40}} = \frac{40 \times 40}{81} = \frac{1600}{81}$

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