The difference between a number and its two-fifth is 510. What is the ten percent of that number?

Question: The difference between a number and its two-fifth is 510. What is the ten percent of that number?Solution:ধরি,সংখ্যাটি xপ্রশ্নমতে,x - (2x/5) = 510⇒ (5x - 2x)/5 = 510⇒ 3x/5 = 510⇒ 3x = 510 × 5⇒ x = 2550/3x = 850∴ সংখ্যাটির 10% = 850 × 10/100 = 85