Question

the dimension of Mr Naresh bedroom is 8m x 7m x 5 m it has to Windows each measuring 2m X 1m and 1 door measuring 3m X 1 m find the cost of whitewashing the room at 50 rupees per square metre

Answer 1

area of cuboid = 2(l b + b h + h l )

area of room = 2 (8*7 +7*5 +5*8)

area of room = 2(56 + 45 + 45 )

area of room = 292 m square

area of window  =  2*1 *2  =  4 m square

area of door = 3*1 = 3 m square

area of whitewashing = 292 - 7 = 285

cost of whitewashing =  292 * 50 = 14,600 rupees