The difference between a number and its two-fifth is 510. What is 10% of that number?  Choose the correct choice from the following choices:  A) 19  B) 85  C) 77  D) 76  E) 78
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   10% of 850= 85.   Answer:85
<result>B</result>
The difference between a number and its two-fifth is 510. What is 10% of that number?