Q. The dimensions of a room are $(9m\times 8m\times 6.5m)$. It has one door of dimensions $(2m\times 1.5m)$ and two windows, each of dimensions $(1.5m\times 1m)$. Find the cost of whitewashing the walls at $Rs.25$ per square meter.

Q. Three cubes whose edges of radii $3cm,4cm$ and $5cm$ are melted together from a single cube. Find the surface area of the new cube.

Q. How many persons can be accommodated in a dining hall of dimensions $(20m\times 16m\times 4.5m)$, assuming that each person requires $5$ cubic meters of air.

Q. A classroom is $10m$ long, $6.4m$ wide and $5m$ high. If each student is given $1.6m^2$ of the floor area, how many students can be accommodated in the room? How many cubic meters of air each student will get?

Q. A godown measures $40m\times 25m\times 15m.$ Find the maximum number of wooden crates each measuring $1.5m\times 1.25m\times 0.5m$ that can be stored in the godown.

Q. The capacity of a cuboidal tank is $50000$ litres of water. Find the breadth of the tank, if its length and depth are respecrively $2.5$ m and $10$ m

Q. The sum of the length, breadth and depth of a cuboid is $19cm$ and the length of its diagonal is $11cm$. Find the surface area of the cuboid.

Q. The volume of a cuboid is $1536m^3$. Its length is $16m$, and its breadth and height are in the ratio $3:2$. Find the breadth and height of the cuboid.

Q. How many bricks will be required to construct a wall $8m$ long, $6m$ high and $22.5cm$ thick if each brick measures $(25cm\times 11.25cm\times 6cm)$?

Q. Find the volume, the lateral surface area and the total surface area of the cuboid whose dimensions are :
length $=12cm$, breadth $=8cm$ and height $=4.5cm$

Q. Find the volume, the lateral surface area and the total surface area of the cuboid whose dimensions are :
length $=15m$, breadth $=6m$ and height $=5cm$

Q. Find the volume, the lateral surface area and the total surface area of the cuboid whose dimensions are :
length $=24m$, breadth $=25cm$ and height $=6m$.

Q. How many planks of dimensions $(5m\times 25cm\times 10cm)$ can be stored in a pit which is $20m$ long, $6m$ wide and $80cm$ deep?

Q. Find the capacity of a closed rectangular cistern whose length is $8m$, breadth $6m$ and depth $2.5m$. Also find the area of the iron sheet required to make the cistern.

Q. A wall $15m$ long, $30cm$ wide and $4m$ high is made of bricks, each measuring $(22cm\times 12.5cm\times 7.5cm)$. If $1/12$ of the total volume of the wall consist of mortar, how many bricks are there in the wall?

Q. A box made of sheet metal costs $Rs.6480$ at $Rs.120$ per square metre. If the box is $5m$ long and $3m$ wide, find its height.

Q. The surface area of a cuboid is $758c{m}^2$. Its length and breadth are $14cm$ and $11cm$ respectively. Find its height.

Q. In a shower, $5cm$ of rain falls. Find the volume of water that falls on $2$ hectares of ground.

Q. Find the volume, the lateral surface area, the total surface area and the diagonal of a cube, each of whose edges measures $9m$. (Take $\sqrt{3}=1.73$)

Q. The total surface area of a cube is $1176c{m}^2$. Find its volume.