Question

find the cost of whitewashing a 15 m *20 m wall 1 m charges Rs. 3.50​

Answer 1

Answer:

15×20=300

300×3.50= 1050.00rs for charge

Answer 2

Answer:

total area for white washing = lateral surface area + l*b

total area for white washing = lateral surface area + l*b = 2*(l+b)*h + l*b

total area for white washing = lateral surface area + l*b = 2*(l+b)*h + l*b = 2*(5+4)*3 + 5*4

total area for white washing = lateral surface area + l*b = 2*(l+b)*h + l*b = 2*(5+4)*3 + 5*4 = 54+20= 74 m2 cost of white washing per m2 = Rs. 7.50 therefore total cost = 7.50*74 i.e., = 750/100*74

total area for white washing = lateral surface area + l*b = 2*(l+b)*h + l*b = 2*(5+4)*3 + 5*4 = 54+20= 74 m2 cost of white washing per m2 = Rs. 7.50 therefore total cost = 7.50*74 i.e., = 750/100*74 = Rs. 555 Therefore the cost for white washing the four walls and the ceiling is Rs.555

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