Question

1. Daniel is painting the walls and ceiling of a cuboidal hall with length, breadth and height of 15 m, 10 m and
7 m respectively. From each can of paint, 100 m² of area is painted. How many cans of paint will he need to
paint the entire room?
(NCERT)​

Answer 1

Answer:

Since , the floor is never painted , hence we consider only 5 faces of cuboidal room to be painted / ceiled , Hence ;

Total surface area painted = ( 15 * 10 * 7 ) - 15 * 10

= 945 m²

Hence , total number of cans = 945 / 100 = 9.45

Hence , 10 cans are utilised approximately .