The difference between a number and its two-fifth is 510. What is 30% of that number?	Choose one
A) 253  B) 255  C) 252  D) 251  E) 254
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   30% of 850= 255.   Answer:255
<result>B</result>
The difference between a number and its two-fifth is 510. What is 30% of that number?