The lengths of the sides of a triangle are in the ratio 3 : 7 : 5. The perimeter of the triangle is 90 inches. What is the length of the largest side

Question

The lengths of the sides of a triangle are in the ratio 3 : 7 : 5.  The perimeter of the triangle is 90 inches.  What is the length of the largest side

mathhelper · Answer

let the sides be 3x, 7x, and 5x. Then 3x+7x+5x = 90 solve for x, sub into my definitions for the longest side.

oobleck · Answer

2(3x+7x+5x) = 90

oobleck · Answer

oops. my bad. I was thinking of a rectangle and hit submit before I saw that there were three sides!