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?
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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
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