The difference between a number and its two-fifth is 510. What is 10% of that number ?
Correct Answer: Option B
Let the number be x. Then, x-(2 \(\div\) 5)x = 510
=> 3x \(\div\) 5 =510
=>x =[510 \(\times\) ( 5 \(\div\) 3)] =850
10 % 0f 850 = 85.
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