Quantitative Aptitude - Arithmetic Ability Questions

If ABCD is a Cyclic Quadrilateral, then the value of Cos2A - Cos2B - Cos2C + Cos2D is

Calculate the difference between the square of the largest and smallest two-digit prime numbers.

If Rs. 87 was divided between James and Radha in the ratio 1: 2, how much money did Radha get?

Square root of 0.9 is equal to

The rate of discount on an article whose marked price is Rs. 170 and selling price is Rs. 130?

n an alloy, lead and tin are in the ratio of 2 : 3. In the second alloy, the ratio of same elements is 3 : 4. If equal quantities of these two alloy are mixed to forma new alloy, then what will be the ratio of these two elements in the new alloy? 

The number of sides of a regular polygon whose exterior angles are each 72 deg is

The surface area of a sphere is 2464 cm². Find its diameter (in cm).