Quantitative Aptitude - Arithmetic Ability Questions

What is the average of first 30 multiples of 9?

A man goes to a place on bicycle at speed of 16 km/hr and comes back at lower speed . If the average speed is 6.4 km/hr in total , then the return speed (in km/hr) is

The mean of 10 observations is 13. Two more observations are included and the new mean becomes 14. The mean of two new observations is

There is 40% increase in an amount in 10 years at simple interest. What will be the compound interest of Rs. 30000 after 3 years at the same rate?

Each of the questions below consists of a question and two statements numbered, I and II given below it. You have to decide whether the data given in the statements are sufficient to answer the question. Read both statements and choose the most appropriate option. Among M, N, D, P and K, who earns more than only the least earner among them?

I. N earns more than M and P but less than only D.
II. M earns more than P who earns more than K.

If cosecA - cotA = x, then the value of x is

24 men can do a piece of work in 17 days.How many men will be able to do it in 51 days ?

Select the odd word/letters/number/number pair from the given alternatives.