1. If \(62\frac{1}{2}\)% of a number is added with itself then rhe result becomes 1560. find the original number.
2. If \(37\frac{1}{2}\)% of a number is subtracted from itself then the result becomes 10500. Find the original number.
3. If \(16\frac{2}{3}\)% of a number is added with itself then the result becomes 15684. Find the original number.
4. If \(15\frac{1}{7}\)% of a number is subtracted from itself then the result becomes -2032. Find the original number.
5. If \(11\frac{1}{9}\)% of a number is added with itself then the result becomes 1800. Find the original number.
6. What is 10% of 40% of 75% of 90.
7. If 10% of (A + B) = 30% of (A – B) then find A:B.
8. 25% of what number is 40.
9. If 72 is added in a number then number becomes \(57\frac{1}{7}\)% of itself. Find the number.
10. If 1953 is added in a number then number becomes \(444\frac{4}{9}\)% of itself. Find the original number.