Surface Area of a Cuboid

Q.

The surface area of a cuboid is $1372c{m}^2$. If the ratio length : breadth : height is $4:2:1$, then its length (in $cm$) is

1. 7

2. 14

3. 28

4. 21

Q.

The length, breadth and height of a cuboid (rectangular solid) are 4 : 3 : 2

i) If its surface area is 2548 $c{m}^2$, find its volume

ii) If its volume is $3000m^3$, find its surface area.

Q. The cost of papering the four walls of a room at $75$ paise per square metre is Rs. $240$. The height of the room is $5$ metre. Find the length and the breadth of the room, if they are in the ratio $5:3$.

1. $20$ m and $12$ m
2. $15$ m and $9$ m
3. $25$ m and $15$ m
4. $30$ m and $18$ m

Q. The length, breadth and height of a room are $5$ $m$, $4$ $m$ and $3$ $m$ respectively. Find the cost of white washing the walls of the room and the ceiling at the rate of $7.50$ per $m^2$.