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Two-fifth of one-fourth of three-seventh of a number is 15. What is half of that number ?

Answer:

Explanation:

$\frac{2}{5}\times\frac{1}{4}\times\frac{3}{7}\times n=15$

$=> \frac{6}{140}\times n =15 => n=\frac{15\times140}{6} => 350$