If one—third of one-seventh of a number is 15, then two-fifth of that number is
Let the number = $$x$$
=> $$\frac{1}{3} \times \frac{1}{7} \times x = 15$$
=> $$x = 15 \times 21 = 315$$
$$\therefore$$ Two fifth of the number
= $$\frac{2}{5} \times 315$$
= $$2 \times 63 = 126$$
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