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

75
85
95
105

Correct Answer: 85

Explanation:

Let the number be x. Then, x-(2/5)x = 510

=> 3x/5 =510

=>x =[510 * ( 5/3)] =850

10 % 0f 850 = 85.

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