Quantitative Aptitude - Arithmetic Ability Questions

wooden bowl is in shape of a hollow hemisphere of internal radius 9 cm and thickness 1 cm. Find the total surface area of the bowl?

If 1-aa3+9 = 19 - a1-a3, then what is the value of a?

Working 7 hours in a day, 4 men can do a piece of work in 8 days. Working 8 hours in a day, the required number of men to perform the same work in 4 days will be

The average height of 30 boys out of a class of 50 is 160 cm. If the average height of the remaining boys is 165 cm, the average height of the whole class (in cm) is:

If a merchant offers a discount of 25% on the list price, then he makes a loss of 5%. What % profit or % loss will he make if he sells at a discount of 10% of the list price?

If √(1 - cos2A) = x, then the value of x is

If a + b = 8 and ab = 15, then what is the value of a3 + b3?

If tan(A/2) = x, then the value of x is