Quantitative Aptitude - Arithmetic Ability Questions

The reciprocal of the sum of the reciprocals of 2/9 and 7/10 is

In a class of 56 students there are 28 girls. The average weight of these girls is 46 kg and average weight of the full class is 51 kgs. What is the average weight of the boys of the class?

You have 20 big and 16 small diaries and want to make gift packs containing both in each pack. What is the maximum number of gift packs you can make without any left over?

What is the measure (in degree) of an exterior angle of a regular polygon of 9 sides?

The diameter of a circle is 28 cm find its area?

Find the circumference (in cm) of a circle of radius 10.5 cm

The area of a circle is 616 sq.m. Find its diameter.

If Girish's salary is 4/9 times of Harishankar's and Shirish's salary is 5/6 times of Harishankar's, what is the ratio of Girish's salary to Shirish's.