Question

solve question number 'e'

Answer 1

let ,
old breadth taken as =b
old length taken as =b+9
the old area=x
the new length is increased by 3=b+9+3=b+12
the new breadth increased by 3=b+3
the new area=84

according to the problem,
(b+12)(b+3)-(b+9)b=84cm
b^2+3b+12b+36-9b=84cm
6b=84-36cm
b=48÷6
b=8
:the old length =8+9=17
the old breadth=8