Question

Find the volume of a wall 30 cm thick to build a room 10 m long ,8m wide and 3.5 cm high leaving 1.06 m^3of the volume for the doors and windows.

Answer 1

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10th

Maths

Surface Areas and Volumes

Surface Area and Volumes

The dimensions of a room ar...

MATHS

The dimensions of a room are (9m×8m×6.5m). It has one door of dimensions (2m×1.5m) and two windows, each of dimensions (1.5m×1m). Find the cost of whitewashing the walls at Rs.25 per square meter.

December 20, 2019avatar

Virendra Mir

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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.

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