The difference between a number and its two-fifth is 510. What is 10% of that number?

12.75 85 204 None of these

85

Let the number be x  So, according to the question x - \(\frac{2 }{5 }\) of x = 510 \(\frac{3 }{5 }\) of x = 510 x = \(\frac{2550}{3 }\)  x = 850 Thus, the number is 850 10% of the number = 85