Quantitative Aptitude - Arithmetic Ability Questions

If C = 1200 and D = 1500, then D is how much percent more than C?

What is the value of (32 cos6x – 48 cos4x + 18 cos2x – 1)/[4 sin x cos x sin (60 – x) cos (60 – x) sin (60 + x) cos (60 + x)]?

PQR is a right angled triangle in which PQ = QR. If the hypotenuse of the triangle is 20 cm, then what is the area (in cm2) of the triangle PQR?

If x - y = 6 and xy = 40, then find x2 + y2 ?

The ratio of present ages of R and S is 6:7. Before 12 years the ratio of their ages was 9:11. What is R's present age (in years)?

A bus runs at 50 kmph. If the speed is increased by 10 kmph, it will cover 20 km more in the same time. Find the actual distance covered?

The largest 5 digit number exactly divisible by 89 is:

In ∆ABC, ∠A = 90°, AD ⊥ BC and AD = BD = 2 cm. The length of CD is