(D) Given: Length $(l) = 5\, m$,Breadth $(b) = 4\, m$,Height $(h) = 3\, m$.We need to whitewash the four walls and the ceiling.Area to be whitewashed

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(D) Given: Length $(l) = 5\, m$,Breadth $(b) = 4\, m$,Height $(h) = 3\, m$.We need to whitewash the four walls and the ceiling.Area to be whitewashed = Area of four walls + Area of ceiling$= 2(l + b)h + (l \times b)$$= 2(5 + 4) \times 3 + (5 \times 4)$$= 2(9) \times 3 + 20$$= 54 + 20 = 74\, m^2$.Cost of whitewashing per $m^2 = Rs. 7.50$.Total cost = $74 \times 7.50 = Rs. 555$.

Class 9 Mathematics Surface Areas and Volumes Textbook - Surface Areas and Volumes

Medium

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

A
$222$
B
$333$
C
$444$
D
$555$

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Surface Areas and Volumes

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Textbook - Surface Areas and Volumes

Find the volume of a sphere whose radius is $0.63 \, m$. Assume $\pi = \frac{22}{7}$. (in $, m^3$)

Easy

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Find the volume of the right circular cone with radius $3.5 \, cm$,height $12 \, cm$. Assume $\pi = \frac{22}{7}$. (in $, cm^3$)

Easy

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Find the curved surface area of a right circular cone whose slant height is $10\, cm$ and base radius is $7\, cm$. (in $, cm^{2}$)

Easy

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The volume of a right circular cone is $9856 \, cm^3$. If the diameter of the base is $28 \, cm$,find the slant height of the cone. (in $, cm$)

Medium

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$A$ solid cube of side $12 \, cm$ is cut into eight cubes of equal volume. What will be the side of the new cube? Also,find the ratio between their surface areas.

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

Similar Questions

Find the volume of a sphere whose radius is $0.63 \, m$. Assume $\pi = \frac{22}{7}$. (in $, m^3$)

Find the volume of the right circular cone with radius $3.5 \, cm$,height $12 \, cm$. Assume $\pi = \frac{22}{7}$. (in $, cm^3$)

Find the curved surface area of a right circular cone whose slant height is $10\, cm$ and base radius is $7\, cm$. (in $, cm^{2}$)

The volume of a right circular cone is $9856 \, cm^3$. If the diameter of the base is $28 \, cm$,find the slant height of the cone. (in $, cm$)

$A$ solid cube of side $12 \, cm$ is cut into eight cubes of equal volume. What will be the side of the new cube? Also,find the ratio between their surface areas.

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