Question

Q.7 Rita bought a door of size 6m x 8whole 2/5 Size of the door of her room is of
.
dimensions 5 whole 1/5 x 7whole 1/5. What fraction of the area should be cut off to
fit the door.

Answer 1

Solution

Given the dimensions of the room are,

8cm,6cm,5cm

Let, l=8cm,

b=6cm,

h=5cm

So, area of the 4 walls of the room=2×(l+b)×h

=2×(8+6)×5

=140cm

2

Hence, the cost of dis-tempering the 4 walls of the room at the cost of Rs.80 per square metre=140×80=Rs.11200

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