Question

The perimeyer of rectangle is 120 cm and length is40cm then what is breath

Answer 1

$length \: = 40 \: cm \\ perimeter \: = 120 \\ 2(40 + b) = 120 \\ 80 + 2b = 120 \\ 2b = 120 - 80 \\ b = \frac{40}{2 } = 20cm \: \\ breadth = 20 \: cm \:$

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