Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the odd number from the given alternatives.

If a3 + b3 = 28 and a + b = 4, then what is the value of ab?

An army lost 10% of its men in war, 10% of the remaining died due to disease and 10% of the rest were declared disabled. Thus the strength of the army was reduced to 7,29,000 active men. The original strength of the army was

Cost price of a calculator is Rs 495. If the profit percentage is 40%, then what is the value (in Rs) of profit?

From a point, 40 m apart from the foot of a tower, the angle of elevation of its top is 60°. The height of the tower is

Kamal has some apples. He sold 40% more than he ate. If he sold 70 apples, how many did he eat?

The base of a parallelogram is twice its height. If the area of the parallelogram is 338 sq.cm. Find its height?

What is the length of the side of a regular hexagon, if its area is 54√3 sq cm?