Question

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 rs 7.50​

Answer 1

ANSWER IS IN THE ATTACHMENT

Answer 2

Step-by-step explanation:

$\large \bold \red{Given :- }$

Length of Room = 5m.

Breadth of Room = 4m.

Height of Room = 3m.

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$\large \bold \red{To \: Find :-}$

The cost of white washing the walls of the room and the ceiling at the rate of ₹ 7.50

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$\large \bold \red{Solution →}$

$\large \bold{Area \: to \: be \: \: white \: washed = Area \: of \: Cuboid - Area \: of \: Base } \\ \\ \large \bold{➡2( LB + BH + LH ) - LH} \\ \\ \large \bold{➡2(LB) + 2(BH) + 2(LH) -LH } \\ \\ \large \bold{➡ \:LB + 2(BH) + 2(LH)} \\ \\ \large \bold \pink{➡ \:[(5 \times 4) + (2 \times 4 \times 3) + (2 \times 5 \times 3)] {m}^{2} } \\ \\ \large \bold \pink{➡(20 + 24 + 30) {m}^{2} } \\ \\ \large \bold \blue{➡74 {m}^{2} }$

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Then,

Cost of White Washing per m² area

= ₹ 7.50

Cost of White Washing per 74m² area

= ₹ ( 74 × 7.50 )

= ₹ 555

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