Quantitative Aptitude - Arithmetic Ability Questions

If √(1 - cos2A) = x, then the value of x is

What is the value of 96+21624?

a and b are irrational numbers such that a+b = q is a rational number; then a­b is

The sum of two fractions is 5/6. One of them is 3/4, what is the other fraction?

What is the average of first 30 multiples of 9?

P and Q are at a distance of 240 km from each other at 9:00 a.m. After 1 hour, P starts moving towards Q at a speed of 25 km/hr. At 11 a.m. Q startsmoving towards P at the speed of 18 km/hr. At what time (in p.m.) will they meet?

The average weight of P, Q and R is 47 kg. If the average weight of P and Q be 32.5 kg and that of Q and R be 48.5 kg, then what is the weight of Q (in kgs)?

If two marbles are picked at random, what is the probability that either both are red or both are green?