M n
5.
A carpet is spread in a room measuring 12m by 9m leaving a space of 30 cm

from the wall all round. What is the area of the carpet?

Well I think we measure

12 x 9 = ?

0.05m

Step-by-step explanation:

Let width of carpet be 'x'm

Therefore, inclusive of border:

Length of room = 8m

Breadth of room = 5m

Length of carpet = 8-x-x = (8-2x)m

Breadth of carpet = 5-x-x = (5-2x)m

Area of room (carpet + border)

=  8*5 = 40sq.m

Area of just carpet

= (8-2x)(5-2x)

= (40-16x-10x+4x^2)

= (4x^2-26x+40)sq.m

Area of just border = 12sq.m (given)

Therefore,

Area of ground = Area of just border + Area of just carpet

=> 40 = 12+(4x^2-26x+40)

=> 0 = 4x^2-26x+12

=> 0 = 2x^2-13x+6 (dividing equation by 2)

=> 0 = 2x^2-12x-x+6

=> 0 = 2x(x-6)-1(x-6)

=> 0 = (2x-1)(x-6)

=> x = 1/2 = 0.5m or 6m

discarding 6m since it is longer than room then

Therefore, width of border = 0.5m

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.

i don't see any

step-by-step explanation: