The difference between a number and its two-fifth is 510. What is 40% of that number?  Answers.
A) 342
B) 340
C) 344
D) 346
E) 348
Let the number be x. Then,   x - 2/5 x = 510   x = (510 * 5)/3= 
<gadget id="calculator">(510 * 5)/3</gadget>
<output>850</output>
850   40% of 850= 340.   Answer:340
<result>B</result>
The difference between a number and its two-fifth is 510. What is 40% of that number?