Quantitative Aptitude - Arithmetic Ability Questions

A train travelling at the speed of 66 kmph crosses a 300 m long platform in 24 seconds. How long was the train?

The standard deviation of the set {10, 10, 10, 10, 10} is

The ratio of three numbers is 2 : 3 : 5. If the sum of the three numbers is 275, then what is the largest among the three numbers?

If 50 less had applied and 25 less selected, the ratio of selected to unselected would have been 9 : 4. So how many candidates had applied if the ratio of selected to unselected was 2 : 1.

In a trapezium ABCD, AB || CD, AB < CD, CD = 6 cm and distance between the parallel sides is 4 cm. If the area of ABCD is 16 sq.cm, then AB is

x, y and z are prime numbers and x + y + z = 38. What is the maximum value of x?

What smallest number should be added to 2401 so that the sum is completely divisible by 14 ?

A vendor buys bananas at 7 for Rs 6 and sells at 6 for Rs 7. What will be the result?