Question

length and breadth of a bulletin board are r cm t cm , respectively

what will be the length (in cm) of the aluminium strip required to frame the board if 10 cm extra strip is required to fix it properly?


By statement​

Answer 1

Step-by-step explanation:

Perimeter of the bulletin board

=

2

(

r

+

t

)

c

m

Area of the bulletin board

=

r

t

c

m

2

(i) Length (in cm) of the aluminium strip required to frame the board = Perimeter + extra strip

=

2

(

r

+

t

)

+

10

c

m

(ii) Repairing 1 board requires

x

nails.

∴

Number of nails required to repair 15 boards =

15

x

(iii) Total area of cloth required = Area of 8 bulletin boards + Area of extra cloth required for 8 boards

= (

8

×

r

×

t

c

m

2

) + (

8

×

500

c

m

2

)

= (

8

r

t

+

4000

)

c

m

2

(iv) Carpenter's charge for making 1 board = Rs

x

∴

Expenditure for making 23 boards = Rs

23

x