Question

the perimeter of the rectangle is 400 cm and length is 140cm . find it's breadth​

Answer 1

Answer:

60cm

Step-by-step explanation:

Perimeter of rectangle =2(l+b)

l=length

b=breadth

400=2(140+b)

200=140+b

200-140=b

b=60

So, Breadth=60cm

Answer 2

$perimeter \: = \: 2 \times (l + \: b) \\ 400 \: = \: 2 \times(140 + b) \\ 400 \: = \: 280 + 2b \\ 400 - 280 \: = \: 2b \\ 120 \: = \: 2b \\ b \: = \: 120 \div 2 \\ b = 60$