Question

the length of a rectangular hall is 4m less than three times length of the hall what is the the length if the breadth is b metre ​

Answer 1

Answer:

Step-by-step explanation:

Let the breadth be b

Length = 3b - 4

Breadth = b

Perimeter of rectangle = 2(l+b)

$=2(3b-4+b)\\\\\\=2(4b-4)\\\\\\=8b-8\\\\\\8=8b\\\\\\\frac{8}{8}=b\\\\\\1cm=b\\\\\\l=3b-4\\\\\\l=3*1-4\\\\\\l=3-4\\\\\\l=-1cm$