Quantitative Aptitude - Arithmetic Ability Questions

If cot(A/2) = x, then the value of x is

If the shopkeeper sells an item at Rs 4400 which is marked as Rs 5000, then what is the discount that he is offering?

The sum of two positive integers is 80 & difference between them is 20. Then what is difference of squares of those numbers ?

The standard deviation of the set {10, 11, 12, 9, 8} is

A train crosses a 550 m long platform in 36 seconds. How long was the train if it was travelling at the speed of 70 kmph?

A vendor buys 6 bananas for Rs 25 and sells them at 3 for Rs 20. What is his profit percentage?

There were 24 studentsina class. One of them, who was 18 years old, left the class and his place was filled up by a new comer.Ifthe average of the class was thereby lowered by 1 month, the age of new comer is-

Simple interest on a sum for 18 months at 14% per annum is Rs 1365.What is the value (in Rs) of sum?