Quantitative Aptitude - Arithmetic Ability Questions

Prahlad has done 1/3rd of a job in 30 days, Sarfaraz completes the rest of the job in 90 days. In how many days can they together do the job?

The marked price is 10% higher than the cost price . A discount of 10% is given to the marked price . In this kind of sale the seller

A solid sphere of diameter 7 cm is cut into two equal halves. What will be the increase (in cm2) in the total surface area ?

Find the odd one out among the following.

If a sum of Rs.12500 is invested for 1 year at 12% per annum interest being compounded semi­-annually, then interest earned is

Find the standard deviation of {11, 7, 10,13, 9}

In the following question, select the odd letters from the given alternatives.

The angles of elevation of the top of a tree 220 meters high from two points lie on the same plane are 30° and 45°. What is the distance (in metres) between the two points?