Quantitative Aptitude - Arithmetic Ability Questions

If (x + 1/x) = 3, then x8+1x8 is equal to

What is the value of 3.6×1.62+0.48×3.61.8×0.8+10.8×0.3-2.16 ?

If cosC + cosD = x, then value of x is

Deepak found that he had made a loss of 10% while selling his smartphone. He also found that had he sold it for ` 50more, he would have made a profit of 5%. The initial loss was what percentage of the profit earned, had he sold the smartphone for a 5% profit ?

Solve the following : -1/4 { -45 - (-96) / (-32)} = ?

Priya's marks in History and Geography are in the ratio 5 : 7. If she got 14 marks more in Geography than in History, what are her History marks?

If 6A = 11B = 7C; find A : B : C

26 is 0.4% of which number?