Question

a class room is 7m long, 6.5m wide and 4m high. it has door 3m×1.4m and four windows each measuring 2m×1m. the interior walls are to be colour washed. the contractor charges ₹10per m². find the cost of color washing ​

Answer 1

Answer:

342.3 rupees

Step-by-step explanation:

Area of four walls=(2h(l+b))

=(2x4(7+6.5))

=(8x13. 5)

=108m square

area of one window =3mx1. 4m

=4.2m square

area of three window =3(2mx1m)

=6m square

total area of windows =(4.2+6)m square

=10.2m square

Area for whitewashing =(108-10.2)m square

=97.8m square

cost of 1 m square white washing = 3.50rupee

cost of 97.8m square white washing=3.50x97.8

=342.3 rupees

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