Quantitative Aptitude - Arithmetic Ability Questions

In a trapezium ABCD, AB and DC are parallel sides and ∠ ADC = 90°. If AB = 15 cm, CD = 40 cm and diagonal AC = 41 cm. Then the area of the trapezium ABCD is

If x + √5 = 5 + √y, and x, y are positive integers, then the value of x+yx + y

A bag has Rs12.9 in the form of 1 rupee, 50 paise and 10 paise coins in the ratio of 3:2:3. How many 50 paise coins are there in the bag?

A car travelling at an average speed of 72 km/hr takes 9 minutes to travel a certain distance. By how much should it increase its speed (in km/hr) to travel the same distance in 8 minutes?

In a class there were 28 boys and some girls. In a test the mean score obtained by the boys was 12.5 while that obtained by the girls was 14.5. If the overall average was 13.1, what was the total number of students in the class?

If a = 1/a-5, then the value of a + 1/a = ?

If 9x - [5(2x + 1)/2] = 9/2, then the value of x is?

What is the fourth proportional to 72, 168 and 150?