If 2805 / 2.55 = 1100, then 280.5 / 25.5 is equal to ?

[(0.87)³ + (0.13)³] / [(0.87)² - 0.87 x 0.13 + (0.13)²] = ?

(.896 x .752 +.896 x .248) / (.7 x .034 + .7 x.966) = ?

The denominator of a fraction exceeds its numerator by 7. If the numerator as well as the denominator is increased by 9, the fraction becomes 2/3. Which of the following is the original fraction?

(0.16)² - (0.12)² = ?

13.03 x 0.0001 = ?

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