Quantitative Aptitude - Arithmetic Ability Questions

The mean of a distribution is 21 and the standard deviation is 7. What is the value of the coefficient variation?

Select the odd letters from the given alternatives.

In a camp 180 students had ration for 20 days. How many students should leave the camp if the ration should last for 25 days?

The age of Dr. Pandey is four times the age of his son. After 10 years , the age of Dr. Pandey will be twice the age of his son . The present age of Dr. Pandey's son is

The sum of all prime numbers between 18 and 32 is:

A man covers a total distance of 100 km on bicycle. For the first 2 hours, the speed was 20 km/hr and for the rest of the journey, it came down to 10 km/hr. The average speed will be

A can complete a work in 20 days and B can complete the same work in 25 days. If both of them work together, then in 3 days what percent of the total work will be completed?

The ratio of sand to gravel in a mixture is 7 : 8 while that between gravel and cement is 6 : 7. What is the ratio of sand to cement in the mixture?