Quantitative Aptitude - Arithmetic Ability Questions

If a - b = -5 and a2+b2=73, then find ab.

The length of the diagonal of a square is 12 cm. Find its area (in cm2).

At what rate of compound interest per annum will a sum of Rs 10000 become Rs 12321 in 2 years?

If 4/5th of 6/7th of a number is 216, then 8/9th of that number will be

When a number is increased by 69, it becomes 103% of itself. What is the number?

If cot(A/2) = x, then the value of x is

Ravi has a roadmap with a scale of 1.5 cm for 18 km. He drives on that road for 72 km. What would be his distance covered in that map.

∆ABC is right angled at B. BD is an altitude. AD = 4 cm and DC = 9 cm. What is the value of BD (in cm)?