Question

A classroom is 7 m long. 6.5 m wide and 4 m high. It
has one door 3 m * 1.4 m and three windows, each
measuring 2 mx 1m. The interior wall are to be
colour washed. The contractor charge Rs. 5.25 per
sq. m. Find the cost of colour washing​

Answer 1

Hi buddy

Answer

08m 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

I hope this solution is helpful for u

Answer 2

Answer: 513.45 Rs

Step-by-step explanation:

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

=[2*4(7+6.5)]

=8*13.5

=108m^2

Area of one window=3*1=4m

=4.2m^2

Area of three windows =3(2*1)=6m^2

Total area of windows=(4.2+6)m^2

=10.2m^2

Area of colour washing=

(108-10.2)

=97.8m^2

Cost of colour washing

=97.8*5.25

=513.45 Rs