Quantitative Aptitude - Arithmetic Ability Questions

Find two numbers such that their mean proportion is 8 and third proportion is 64.

If [a + (1/a)]2 – 2[a – (1/a)] = 12, then which of the following is a value of 'a'?

If a + b + c + d = 4, then the value of 1(1-a)(1-b)(1-c) + 1(1-b)(1-c)(1-d) + 1(1-c)(1-d)(1-a) + 1(1-d)(1-a)(1-b)

Find out the odd word/letters/number/number pair from the given alternatives.

What should be added to 8(3x - ­4y) to obtain 18x ­- 18y?

ΔDEF is right angled at E. If cosD = 8/17, then what is the value of secF ?

A boat covers 143 km upstream in 13 hours and the same distance downstream in 11 hours. What is the speed (in km/hr) of the boat in still water?

What is the value of ( 1/2 - cot45) ?