Quantitative Aptitude - Arithmetic Ability Questions

If cos 240° = x, then value of x is

If the amount received at 10% per annum Compound interest after 3 yrs is Rs 19965, then what will have been the principal (in Rs) amount?

A's salary was decreased by 50% and subsequently increased by 50%. How much percent does he lose?

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

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

In triangle ABC, ∠ABC = 15 deg. D is a point on BC such that AD = BD. What is the measure of ∠ADC (in degrees)?

If 4r = h + r2+h2 then r: h = ? (r not equal to 0)

If 192 pens cost is Rs.10, how many pens can be bought for Rs.5?