Two-fifth of one-third of three-seventh of a number is 15. What is 40% of that number?  Choose the correct choice from the following answers.
A) 72 B) 84 C) 136 D) 140 E) None of these
Explanation:   Let the number be x. Then,   2/5 of 1/3 of 3/7 of   x = 15 =&gt; x = (15 * 5/3 * 3 * 5/2) = 525/2   40% of 525/2 = (40/100 * 525/2)= 
<gadget id="calculator">(40/100 * 525/2)</gadget>
<output>105</output>
105   Answer IS None of these
<result>E</result>
Two-fifth of one-third of three-seventh of a number is 15. What is 40% of that number?