Question

Length of rectangle is increased by 10℅ . Find ℅ change in breadth so that there is 20℅ increase in its area

Answer 1

Step-by-step explanation:

Let length =x meter

Breadth=y meter

Area of rectangle= length×breadth

length increase by 10% and breadth increase by 20%

New length=1.1× meter

New breadth=1.1y meter

New rectangle area :1.1x×1.1y =1.32xy sq. m

Increase in area :1.32xy=xy0.32xy sq. m

%increase in area :(0.3232xy/xy) ×100=32%sq.m

Ans : 32% in area