Math, asked by ss6265949, 10 months ago

9. A room is 40 m long, 30 m broad and
10 m high. Find the cost of whitewashing
its four wall and ceiling at 20 per sq m.​

Answers

Answered by Anonymous
5

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Area to be white washed = 2 (by+hl) +lb

= 2(30×10+10×40) +40×30

= 2(300+400) +1200

= 2(700) +1200

=1400+1200

=  {2600m}^{2}

Cost of white wash of = {1m}^{2}

= Rs. 20

Cost if white wash of = {2600m}^{2}

=  \frac{2600}{20}

=Rs.130

Answered by Anonymous
1

Step-by-step explanation:

Area to be white washed = 2 (by+hl) +lb

= 2(30×10+10×40) +40×30

= 2(300+400) +1200

= 2(700) +1200

=1400+1200

={2600m}^{2}

Cost of white wash of ={1m}^{2}

= Rs. 20

Cost if white wash of ={2600m}^{2}

=\frac{2600}{20}

=Rs.130

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