What will come in place of question mark (?) in the following questions ?
$$\frac{3}{7} of \frac{4}{5} of \frac{5}{8} of 490=?$$
Let x be the unknown quantity, then
x = $$\frac{3}{7}\times\frac{4}{5}\times\frac{5}{8}\times490 = \frac{3}{7}\times\frac{1}{2}\times490$$ = 105
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