Question

13. A hall is 12 m long, 10 m wide and 5 m high. Its wall and the roof are to be whitewashed from inside
Find the total area to be whitewashed. Also, find its cost at the rate of 5.40 per sq.m.​

Answer 1

Step-by-step explanation:

Height=5m

Length=12m

Width=10m

Area of 4 Walls = 2*Height(Length+Width)

→ 2*5(12+10) m²

→ 10*22 m²

→ 220m²

Area of roof = Length*Width

→ 12*10 m²

→ 120m²

Total area → (220+120)m²

→ 340m²

Rate = m²/₹5.40

Price = 340/5.40

₹62.96

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Answer 2

Answer:

Total area of white washed-

2×(l+b)h+l×b

2×(12+10)5+12×10

10×22+120

220+120

340 sq.m.

cost of white washed-

₹340×5.40

₹1836