Question

the length of the rectangle is three times its breadth if the length is decreased by 3 centimetre and the breadth is increased by 5 cm the area of the rectangle is increased 57 CM square find the perimeter of the rectangle​

Answer 1

Answer:

48cm

Step-by-step explanation:

Let breadth=x

Then, length=3x

Area = 3x(x)

        =3x²

Also,

(Lenght-3)(Breadth+5) = 3x²+57

(3x-3)(x+5)=3x²+57

3x²-3x+15x-15=3x²+57

12x-15=57

12x=72

 x=6

Perimeter = 2(Lenght+Breadth)

                = 2(3x+x)

                =2×4(6)

                =48cm