Question

The perimeter of a triangle is 48 inches and the sides are in the ratio of 3:4:5. Find the length of the longest side.
A.4
B.9
C.16
D.20

Answer 1

3x+4x+5x=48
12x=48
x=48/12
x=4

substitute the x=4 into these equations to get the longest side:
3x=3(4)=12
4x=3(4)=16
5x=5(4)=20

therefore the longest side is 20.

Answer 2

Oh thank you that makes it a lot easier I think I get it now

Answer 3

your welcome, hope that helps alot

Answer 4

alternative :
the longest side = 5/(3+4+5) * perimeter = 5/12 * 48 = ...