Question

A room is 10 m long , 6 m wide and 4.2 m high . It has one door of 2.5 m × 1.5 m and one window of dimension 1.5 m × 1. Find the cost of whitewashing the walls at ₹2.50 per sq. M
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Answer 1

Answer:    

333.0 Rs

Step-by-step explanation:

Area of room=2×h(l+b)

=2×4.2 (10+6)

=8.4×16

=134.4 sq.m

area of door

 2.5×1.5

=3.75 sq.m

area of Window =1.5×1

=1.5 sq.m

area of walls=room-door-window

=134.4 -3.75 -1.5

=132.15 sq.m

cost of whitewashing

132.15×2.50

=333.0 Rs

Answer 2

Answer:

cost of whitewashing the walls is ₹320.375

Step-by-step explanation:

Length = 10 m

Width = 6 m

height = 4.2 m

LSA of room = 2h ( l + b )

LSA of room = 2*4.2 (10 + 6)

LSA of room =  8.4 (16)

LSA of room = 134.4 m^2

Area of window = wl = 1.5*1 = 1.5 m^2

Area of door = wl = 2.5 × 1.5 = 3.75 m^2

Area to be whitewashed = 133.4 - (1.5 + 3.75)

Area to be whitewashed = 133.4 - 5.25 = 128.15 m^2

Cost of whitewashing = ₹2.50 per sq. m^2

Cost of whitewashing = 128.15*2.50 = ₹320.375

Just go for it