Question

A room is 20 metre long, 10m wide, 6.5 metre high. If it has 4 doors each of 2.4m × 1.25 and 8 windows each of measurement 1.25m × 0.6m find the cost of white washing the room at 75 paise Per square metre

Answer 1

whitewashing = so the LSA + the roof
= 2h(l+b) + lb = 590 m^2

now we have to subtract the area of windows + area of door
area of 8 windows = 8xlb = 6m^2
area of 4 doors = 4xlb = 12m^2

590-(12+6) ==> 590-18 ==> 572 m^2

cost ==> 75/100 x 572 ==> rs.429

( calculations in the below image )

Answer 2

Step-by-step explanation:

the answer of your question is ₹492