The difference between a number and its two-fifth is 510. What is 50% of that number?	Choose the correct choice from the following:
A) 426	B) 425	C) 427	D) 428	E) 429
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   50% of 850= 425.   Answer:425
<result>B</result>
The difference between a number and its two-fifth is 510. What is 50% of that number?