Quantitative Aptitude - Arithmetic Ability Questions

The circumference of a circle is 110 cm. Find its radius (in cm).

The mean of the 5 smallest numbers from a group is 15 while the mean of all the 13 members of the group taken together is 17. What is the mean of the 8 largest numbers?

Find the simple interest on Rs. 50 for 6 months at the rate of 10 paise per rupee per month.

A man covered a certain distance by a train at the speed of 40 km/hr and covers the same distance back by walking at the speed of 8 km/hr. Ifthe whole journey took 12 hours, then what is the one side distance (in km)?

Iftan 450=cot∅, then the value of ∅, in radians is 

If a2+1a2 = 38, then find the value of a-1a?

What is the value of cos (90 – B) sin (C – A) + sin (90 + A) cos (B + C) – sin (90 – C) cos (A + B)?

What is the value of sec 30° + cot 30°?