Question

the sides of a triangle are in the ratio 7:5:3 and its perimeter is 30cm.find the lengths of the sides

Answer 1

Let the sides be 7x,5x,3x Then, 7x+5x+3x=30 =>15x=30 =>x=30/15=2 Therefore sides are, 2*7=14 2*5=10 2*3=6

Answer 2

let the sides be=7a,5a and 3a 
∴7a+5a+3a=30
⇒15a=30
⇒a=30/15
⇒a=2
∴7a=7*2=14cm
5a=5*2=10cm
and,3a=3*2=6cm 
                          hope that this will help u.