Question

the length of a room is twice its breadth and thrice its height if the cost of carpeting the floor at rs 80 per sq metre is rs 9000 find the cost of plastering its wall and ceiling at rs 35 per sq metre
help pleasee​

Answer 1

Answer:

6480Rs

Let the height =h. Then Length of wall =2h and breadth =1

2

1

h.

Cost of white washing wall =Rs 3584.

Area of wall white washed =

rateofwhitewashingpersq.m

Costofwhitewashingwall

=

32

3584

=112m

2

Area of wall of a room is lateral surface area of a cuboid

Then, 2h(l+b)=112

or,2h(2h+

2

3

h)=112

or,2h(

2

7h

)=112

or,7h

2

=112

or,h

2

=16

orh=4.

Height of cuboid=h=4m

Length of cuboid=2h=8m

Breadth of cuboid=

2

3

h=6m

Area of floor =l×b

=8×6=48m

2

Cost of tiling the floor at Rs.135 per sq. m =135×48=Rs.6480

sorry dear need some points

Answer 2

refer to the attachment

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