Quantitative Aptitude - Arithmetic Ability Questions

What is the simplified value of (cos4 A – sin4 A)?

The mean of marks secured by 45 students in division A of class X is 69, 65 students of division B is 65 and that of 50 students of division C is 63. Find the mean of marks of the students of three divisions of Class X.

If Mr. Raghav taught a total of 500 hours, then what is the difference in number of hours of teaching algebra and modern Maths?

In what time will a 100 metre long train running with a speed of 50 km/hr cross a pillar?

If the ratio of cost price and selling price be 10:11, then the profit percentage is

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)?

If 9/4th of 7/2 of a number is 126, then 7/2th of that number is _____.

If a + b = 4 and ab = -5, then what is the value of a3 + b3?