The lengths of the sides of a triangle are in the extended ration 3: 7: 5. The perimeter of the triangle is 90 inches. What is the length of the longest side?

Answer 1

we don't know the lengths of the side, but if one side is 3x, the others are 7x and 5x.

The sum of the lengths of the sides is 90 so 3x + 5x + 7x = 90 and 15x = 90 and x = 6

the longest side is 7x so the longest side is 7*6 = 42