Question

The perimeter of a triangle is 240. Its sides are proportional to 3:4:5. The largest side of the triangle is

Answer 1

3n +4n +5n = 240
12n = 240
n = 240/12

n = 20

the length of sides of this triangle will be 

3*20=60
4*20=80
5*20=100

bc. 60+80+100 = 140+100=240

hope helped