The length of a rectangular grass field is thrice its width , If the sum of length and breadth is 40 cm.
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Let length of rectangle=lcm
breadth of rectangle= bcm
Given length is 3 times its breadth
i.e. l= 3×b
Perimeter of the rectangle= 120 cm
i.e.2×( l+ b)=120
2×(3×b+ b)=120
2×(4×b)=120
8×b=120
b= 15 cm
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