Question

length of a rectangle is four times its breath . if length and breath both are increased by 3cm, the area of the new rectangle will be 84sq.cm. more than the area of the given rectangle. find the length and breath of the given rectangle

Answer 1

let breath of rectangle is x
length=(x+9)
area=x(x+9)
x+3 (x+9+3)
x(x+9)+84
x²+12x+3x+36x
x²+9x+84
x²+15x-x²-9x
84-36
6x=48
x=48/6
x=8
breath=8cm
length=17cm