Question

2m into 1.5 into 1m
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Answer 1

Answer:

Total surface area of the room=2(lh+lb+hb)m

2

=2[9×6.5+9×8+8×6.5]m

2

=365m

2

Area of the door =l×b=2×1.5=3m

2

Area of the windows=l×b=1.5×1=1.5m

2

∴ Surface area of walls=TSA of room −Area of door−Area of windows

=365−3−1.5=360.5m

2

Cost of whitewashing per square meter=Rs. 6.40

∴ Cost of whitewashing the walls=Rs. 6.40×360.5

=Rs. 2307.2.

Answer 2

Total surface area of the room=2(lh+lb+hb)m2

=2[9×6.5+9×8+8×6.5]m2=365m2

Area of the door =l×b=2×1.5=3m2

Area of the windows=l×b=1.5×1=1.5m2

∴ Surface area of walls=TSA of room −Area of door−Area of windows

=365−3−1.5=360.5m2

Cost of whitewashing per square meter=Rs. 6.40

∴ Cost of whitewashing the walls=Rs. 6.40×360.5

=Rs. 2307.2.