Question

the sides of a triangular plot are in the ratio 3:5:7 and its perimeter is 300m wt will be its area

Answer 1

let the three sides be 3$x$,5$x$,7$x$
given perimeter of triangular plot =300
 3$x$+5$x$+7$x$=300
 15$x$=300
$x$=300/15
$x$=20
therefore first side =3x20=60
second side =5x20=100
third side=7x20=140

Answer 2

let side be 3x,5x,7x
so perimeter of triangle=3x+5x+7x
300=15x
so x=20
3x=60
7x=140
5x=100