Question

two fifth of one third of three seventh of a number is 15 , what is the 40% of that number.​

Answer 1

$ans$

$let \: the \: no \: be \: x \\ then \: \frac{2}{5} \times \frac{1}{3} \times \frac{3}{7} \times x = 15 \\ \\ \frac{2x}{35} = 15 \\ \\ x = \frac{15 \times 35}{2} \\ \\ therefore \: 40\%of \: x = \frac{40}{100} \times \frac{15 \times 35}{2} = \: 105 \: ans$