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Preeti Roy

· started a discussion

· 1 Months ago

63 (Question: 110685.0 )

how its 2 x(l+b)x h +(lxb)

Question:
A cistern from inside is 12.5 m long, 8.5 m broad and  4 m high and is open at top. Find the cost of cementing the inside of a cistern at Rs.24 per sq. m
Options:
A) Rs.6582
B) Rs.8256
C) Rs.7752
D) Rs.8752
E) None of these
Solution:

Area of surface to be cemented = 2 x (l+b) x h + (lxb)

i.e, area of four walls + area of floor 

= 2 x (21) x 4 + (106.25) 

= 274.25 m2 

∴ cost of cementing = 24 x 274.25 = Rs.6582


Knowledge Expert

· commented

· 1 Months ago

ok good :)

Knowledge Expert

· commented

· 1 Months ago

its,
area of four walls + area of floor

=hl+hl+bh+bh + lb

=2hl+2bh + lb

=2h(l+b) + lb

=2x(l+b) + lb

Thats it....

Preeti Roy

· commented

· 1 Months ago

i got it
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