Question

perimeter of rectangle =20cm,breadth=40cm, length =?

Answer 1

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PERIMETER =200cm
LENGTH=?
BREATH =40cm.

Since,

PERIMETER =2(LENGTH + BREADTH)

200=2(LENGTH+40)

200=2LENGTH + 80

200-80=2LENGTH

120/2=LENGTH

60cm=LENGTH


HOPE IT HELPS

Answer 2

$heya \\ \\ perimeter \: of \: rectangle \: having \: length \: l \: and \: breadth \: b \: is \: 2(l + b) \\ \\ \\ \\ \\ according \: to \: the \: question \: \\ \\ 2(l + b) = 20 \\ \\ l + b = 10 \\ \\ l = 10 - 40 \\ \\ l = - 30cm \: \: \: (absurd) \\ \\ given \: question \: is \: wrong$