Find the lengths of the two unknown sides using an equation. What is the equation?

Question

The perimeter of a triangle is 60 ft. One side is 12 feet long. of the two unknown sides, one of them is twice as long as the other. Find the lengths of the two unknown sides using an equation. What is the equation?

Answer 1

Let x = the length of one missing side

Let 2x = the length of the other missing side

P = a + b + c

60 = 12 + x + 2x

48 = 3x

x = 16 feet

2x = 32 feet