Question

a hall is 12 m long ,10 m wide and 5 m high .it walls 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

Answer:

Total area to be whitewashed is 340 sq.m.

Total cost would be 1836 rs.

Step-by-step explanation:

Length = 12m

Breadth = 10m

Height = 5m

Rate of whitewashing = 5.40 rs. per sq.m

Total area to be whitewashed = Area of four walls+Area of the roof

So, total area = 2(l+b)h + l×b

= 2(12+10)5 + 12×10

= 10×22 + 120

= 220 + 120

= 340 sq.m.

Now, expense = 340 × 5.40

= 1836.00 rs.

Answer 2

Step-by-step explanation:

2 (12+ 10) 5+12×10

= 10×22+120

= 220+ 120

= 340 sq.m

now , expense = 340×5.4

= 1836.00.