Quantitative Aptitude - Arithmetic Ability Questions

Rs. 750 invested for 3 months gave an interest of Rs. 18. What was the simple rate of interest per annum?

In a class of 60 students there are 30 girls. The average weight of these girls is 58 Kg and average weight of the full class is 63 kgs. What is the average weight of the boys of the class?

The volume of a spherical balloon is increased by 700%. What is the percentage increase in its surface area?

If 2/3(6x/5 - 1/4) + 1/3 = 9x/5, then what is the value of x?

∆XYZ is right angled at Y. If m ∠Z = 60. What is the length (in cm) of YZ, if ZX = 9√3 cm?

A man is running at the speed of 20 km/hr. What is time (in seconds) taken by man to cover one round of a circular garden of radius 350 metres?

Identical cubes of largest possible size are cut from a solid cuboid of size 65 cm × 26 cm × 3.9 cm. What is the total surface area (in cm2) of all the small cubes taken together?

The average age of 6 members of a family is 20 years. If the age of the servant is included, then the average age increase by 25%. What is the age (in years) of the servant?