coins were 200, find the number of coins of each denomin
10n.
12. The perimeter of a rectangular field is 80 m. If the length of the field is decreased by 2 m and breadth is
increased by 2 m, the area is increased by 36 m². Find its length and breadth.
Rashmi's garden is now a square. If she enlarges it by increasing the width 1 metre and the length
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Answer:
2(l+b)= 80m
l+b =80/2
l+b= 40m
l = 40- b
area = b(40-b)= 40b-b^2
if b increased by 2m = b+2
if l is decreased by 2m = l-2
=40-b-2
=38-b
area increased by 36m = 40b-b^2+36
area=l×b
40b-b^2+36 =(38-b)(b+2)
36b-40b = 36-76
-4b= -40
b= -40/-4
b= 10m
length=40-10m
= 30m
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