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Answer:
breadth=5cm, length=15 cm
Step-by-step explanation:
breadth=x
length=3x
perimeter of rectangle=2l+2b
2(1x+3x)=40
2*4x=40
8x=40
x=40/8
x=5
breadth=5cm
lenght =3*x
=3*5=15
length is 15cm
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