Quantitative Aptitude - Arithmetic Ability Questions

At 5% simple interest per annum a certain sum yields a total amount of Rs. 2,790 at the end of 3 1/4 years. The sum invested was

Select the odd word/letters/number/number pair from the given alternatives.

A boat covers a distance of 14 km upstream and 16 km downstream in 9 hours. It covers a distance of 12 km upstream and 40 km downstream in 11hours. What is the speed (in km/hr) of the boat in still water?

If cosA/(1 - sinA) = x, then the value of x is

Find the value of  x3 - y3, if x - y = 4 and xy = 12.

If 3.5x = 0.07y, then find the result of [y-x / y+x]

An army lost 10% of its men in war, 10% of the remaining died due to disease and 10% of the rest were declared disabled. Thus the strength of the army was reduced to 7,29,000 active men. The original strength of the army was

If the roots of the equation a(b – c)x2 + b(c – a)x + c(a – b) = 0 are equal, then which of the following is true?