A rectangular room is 4.5 m long ,4m wide and 3 m high . Find the cost of whitewashing it's walls at the rate of rupees 7.50 per square metre
Devyansh111:
area of 4 walls=3(l+b)xh so 2(4.5+4)x3 = 51 m sq. cost = 51 x 7.5=382.5
2(lb+bh+hl)
382.5 rupees
Answers
Answered by
150
Area to be Whitewashed =2(lh+bh)
Area
= 2 ( 4.5 * 3 + 4 * 3 )
= 2( 13.5+12)
= 2 ( 25.5)
= 51 m²
Cost of white washing = 51 * 7.50 = 382.5 Rupees
Area
= 2 ( 4.5 * 3 + 4 * 3 )
= 2( 13.5+12)
= 2 ( 25.5)
= 51 m²
Cost of white washing = 51 * 7.50 = 382.5 Rupees
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Answered by
92
walls surface area of room = 2( L + B ) × h
2 (4.5 + 4 ) × 3 = 51 sq m
cost of white washing @ 7.50 sq m = 51 × 7.5 = 382.5 rupees
2 (4.5 + 4 ) × 3 = 51 sq m
cost of white washing @ 7.50 sq m = 51 × 7.5 = 382.5 rupees
810 will cost
this is so easy
first find the lateral surface area
the answer get
and multiple with
7.50
super
all walls or only 4 walls
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