**(1)** **The volume of rectangular block of stone is 10368 cu m. Its dimension are in the ratio 3 : 2: 1. If entire surface is polished at the rate 2 paise per sq. m. Then find the total cost of polishing.**

**Hence Rs 63.69 will be the final cost to polish the whole surface area**

**(02) The maximum length of a pencil that can be kept in a rectangular box of dimension 8 cm * 6 cm * 2 cm is ?**

**(03) How many bricks each measuring 25 cm * 11.25 cm * 6 cm will be needed to build a wall 8 m * 6 m * 22.5 cm **

**Hence 6400 bricks needed to build the required wall.**

**(04) A hall is 15 m long and 12 m broad. if sum of the area of floor and ceiling is equal to the sum of area of four walls. Find the volume of the hall?**

**(05) A cistern of capacity 8000 liters measures externally 3.3 m by 2.6 m by 1.1 m and its walls are 5 cm thick. Find the thickness of the bottom of the cistern**

Hence 10 cm is the thickness of the bottom of the cistern

**(06) A rectangular water tank is 80 m * 40 m. Water flows into it through pipe 40 sq cm at the opening at the speed of 10 Km/Hr. By how much the water level will rise in half an hour**?

Hence 20 cu. meter volume of water flows through the pipe into the tank.

Now the rise in tank’s water level can be calculated as:

**The water level rises by 5/8 cm in half an hour.**