Quantitative Aptitude - Arithmetic Ability Questions

Which of the following is the least of all?

If A and B together do a job in 7.5 days and if A could do the job in 10 days if he worked alone. How many days would B take to do the job if he worked alone?

In the given figure, O is centere of the circle. Circle has 3 tangents. If angle QPR = 45 deg, then what is the value (in deg) of angle QOR ?

The present population of a town is 26010. It increases annually at the rate of 2%. What was the population of town 2 years ago?

If the radius of the cylinder is increased by 25%, then by how much percent the height must be reduced, so that the volume of the cylinder remains same?

A can finish a work in 18 days and B in 36 days. If they work on it together for 9 days, then what percent of work is left?

Two equal arcs of two circles subtend angle of  60° and 75° at the centre. The ratio of the radii of the two circles is

If x+1x=5, then the value of 6xx2+x+1 is,