Question

The length, breadth and height of a room are 5m,4m and 3m respectively, find the cost of white washing the walls of the room and the ceiling at the rate of Rs.7.50 per m²

Answer 1

Answer:

Length x height = 5 x 3 = 15 x 2 (for the two walls) = 30m2

Breadth x height = 4 x 3 = 12 x 2 (for the other two walls) = 24m2

30 + 24 = 54m2

54m2 x 7.50 = 405.00

Hope this helps!

Step-by-step explanation:

Answer 2

$\huge\mathbb{A~N~S~W~E~R~}$
$<b>$

→ Find area of four walls :-

$= 2h(l + b) \\ \\ = 6 \times 9 \\ \\ = 54 { \: m}^{2}$

→ Find area of ceiling :-

$= l \times b \\ \\ = 5 \times 4 \\ \\ = 20 { \: m}^{2}$

→ Area for white washing :-

$= (54 + 20) { \: cm }^{2} \\ \\ = 74 \: {m}^{2}$

→ Cost for white washing :-

$= 74 \times 7.5$

${=~555~Rs.}$

${\large\color{Red}{Answer~is~ Rs.~555~ }}$

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