Question

The length of the ractangle is five cm more than its breadth if the parameter is 40 cm find the area of rectangle

Answer 1

parameter = 2(l+b) =40
and l=5b
substitute the value of l in parameter
2(5b+b)=40
b= 3.34
now again
2(l+3.34)=40
l= 16.66
now area of rectangle =l*b =16.66*3.34 = 55.65

Answer 2

let B=x
  then L=x+5
2(x+5+x)=40
or  2x+5=20
or x=15\2
then Area =L×B =15\2×25\2=375\4=9.375cm²  ans