Question

Two-fifth of one-third of three-seventh of a number is 15 What is 40 percent of that number?

• A. 72
• B. 84
• C. 105
• D. 140

Answer 1

The correct option is C 105

Let the number be x
Then $\frac{2}{5}\times \frac{1}{3}\times \frac{3}{7}\times x=15$
$\frac{2x}{35}=15$
$x=\frac{15\times 35}{2}$
$\therefore 40percentofx=\frac{40}{100}\times \frac{15\times 35}{2}=105$