Find : $3 \div \frac{6}{7} + 7 \div \frac{21}{2}$ $-\frac{2}{5}$

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Solution

The correct option is B
$3 \div \frac{6}{7} + 7 \div \frac{21}{2}$ $- \frac{2}{5}$
= $3 \times \frac{7}{6} + 7 \times \frac{2}{21}$ - $\frac{2}{5}$
The L.C.M. OF 2,3,5 is 30.
Hence, $\frac{- 90 + 20 - 2}{30}$
= $\frac{98}{30}$
= $3 \frac{23}{30}$

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