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 ceiling at the rate of Rs 7.50 per m²




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Answer 1

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 ceiling at the rate of Rs 7.50 per m²

Given :-

• length of the room :- 5m
• breath of the room :- 4m
• height of the room :- 3m

To find :-

• white washing the walls and the celling price of room

Formula :-

• area of cuboid :- 2(lb + BH + lh)
• area of base :- length × breath

Solution :-

$\longrightarrow \sf 2(lb + bh + lh) - lb \\ \\ \\ \longrightarrow \sf \: 2(lb) + 2(bh) + 2(lh) - lb \\ \\ \\ \longrightarrow \sf \: lb + 2(bh) + 2(lh) \\ \\ \\ \longrightarrow \sf \: (5 \times 4) + (2 \times 4 \times 3)(2 \times 5 \times 3) {m}^{2} \\ \\ \\ \longrightarrow \sf \: (20 + 24 + 30) {m}^{2}$

$\longrightarrow \sf \: 74 {m}^{2}$

cost of white washing perm² area :- rs. 7.50

cost of white washing 74m² area :-

$\longrightarrow \sf \: rs(74 \times 7.50) \\ \\ \\ \longrightarrow \sf rs = 555$

∴ cost of white washing wall and celling price of room is rs.555

Answer 2

Answer:

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 ceiling at the rate of Rs 7.50 per m²

Given :-

length of the room :- 5m

breath of the room :- 4m

height of the room :- 3m

To find :-

white washing the walls and the celling price of room

Formula :-

area of cuboid :- 2(lb + BH + lh)

area of base :- length × breath

Solution :-

$\longrightarrow \sf 2(lb + bh + lh) - lb \\ \\ \\ \longrightarrow \sf \: 2(lb) + 2(bh) + 2(lh) - lb \\ \\ \\ \longrightarrow \sf \: lb + 2(bh) + 2(lh) \\ \\ \\ \longrightarrow \sf \: (5 \times 4) + (2 \times 4 \times 3)(2 \times 5 \times 3) {m}^{2} \\ \\ \\ \longrightarrow \sf \: (20 + 24 + 30) {m}^{2}$

$\longrightarrow \sf \: 74 {m}^{2}$

cost of white washing perm² area :- rs. 7.50

cost of white washing 74m² area :-

$\longrightarrow \sf \: rs(74 \times 7.50) \\ \\ \\ \longrightarrow \sf rs = 555$

∴ cost of white washing wall and celling price of room is rs.555