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

2 is 10% of what number.

The difference between a number and its three fifths is 50. What is the number? a. 75 b. 125 c. 100 d. none of these

If the difference between a number and two fifths of the number is 30, find the number.

The difference between 38% of a number and 24% of the same number is 135.10. What is 40% of that number?