Question

the length of a rectangular wooden board is thrice it's width . if the width of the board is 120cm find the cost of framing it at the rate of rs 5 for 20cm. ​

Answer 1

Answer:

240 Rs

Step-by-step explanation:

width of board= 120 cm

length of board= 3×width

                         = 3×120

                           =360 cm

Now we have the length as well as the width.

Framing involves calculating the Perimeter

Perimeter of board= 2( l+w)

= 2( 120+ 360)

=2(480)

=960 cm

Cost for 20 cm= 5 Rs

Cost for 1 cm = $\frac{5}{20}$ Rs

Cost for 960 cm = $\frac{5}{20}$×960 Rs

=240 Rs

Answer 2

Answer:

length of a rectangle =x

width of a rectangle =3x+120

3x = 120

=120/3

x =4

The cost of framing =5×20

=100

100×4=400cm

I HOPE YOU HELP