A closed metal box measures 30 cm × 20 cm × 10 cm. Thickness of the metal is 1 cm. The volume of the metal required to make the box is:

A square field has its area equal to 324 m\(^2\). The perimeter of the field is:

The difference between the simple interest and the compound interest (compounded annually) on Rs. 2000 for 2 years at 8% per annum will be:

A farmer has some hens and some goats. If the total number of animal heads is 80 and the total number of animal feet is 200, what is the total number of goats?

A dealer marked his goods 20% above the cost price and allows a discount of 10%. Then the gain percent is:

A starts a business with Rs. 5000 and B joins the business 5 months later with an investment of Rs. 6000. After a year they earn a profit of Rs. 34000, find the shares of A and B in the profit amount depending on their individual investment.

A man went to the Reserve Bank of India with Rs. 2000. He asked the cashier to give him Rs. 10 and Rs. 20 notes only in return. The man got 150 notes in all. How many notes of Rs. 10 did he receive?

A man can row 5 km/h in still water. If the speed of the current is 1 km/h, it takes 3 hrs more in upstream than in the downstream for the same distance. The distance is:

'A' can do a piece of work in 20 days and 'B' can do the same work in 15 days. How long will they take to finish the work, if both work together?