Question

A room is 10m long, 6m broad and 5m High it has one door of dimensions 2 m by 1.5 m and 2 Windows each of dimensions 1m by 1m .Find the cost of whitewashing the walls at rupees 20 per square metre

Answer 1

Answer:

Step-by-step explanation:

area of room = lxbxh

=10x6x5 =300m

area of door = lxbxh

=2x2x1.5=6m

whitewashing the walls = area of room - area of door

  = 300cm -6 cm

=294 m

whitewashing 1 m= rs. 20

whitewashing 294m =294x 20

  = rs. 5880

Answer 2

Step-by-step explanation:

Area of room = 2 ( l + b ) × h

= 2 ( 10 + 6 ) × 5

= 160 squ. m.

Now, Area of door = l × b

= 2 × 1.5

= 3 squ. m

Area of window = Side × side

= 1 × 1

= 1 squ. m

There are 2 windows so total area of windows will be 2 squ. m.

Now, Area of walls = Area of room - ( Area of door + area of windows )

= 160 - ( 3 + 2 )

= 155 squ.m.

Cost of whiteashing the walls = 155 × 20

= 3100 rs.