Quantitative Aptitude - Arithmetic Ability Questions

In the following pair of words, pick the odd pair which is odd from the others?

In figure 'O' is the centre of a circle. The area of sector OAPB is 5/18. of the area of the circle find 'x'.

The value of a machine depreciates at the rate of 20% per annum. If its present value is Rs 96000, then what was the value (in Rs) of the machine 2 years ago?

Two numbers are in the ratio 4:5 and their HCF is 13. Their LCM is

If 4x + 3y = 11 and 3x + 2y = 8, then (x,y) is

If cos -4π/3 = x, then the value of x is

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

If -3[1-(x/2)] + 5x/3 = 1/6, then what is the value of x?