The first side of a triangle is twice the length of the second side; the third side is 20 feet less than three times the second side. The perimeter of the triangle is 106 feet. Find the three sides.

Let the second side be x

then,

first side = twice the length of the second side

= 2x

third side = 20 feet less than three times the second side

3 (second side) - 20

= 3 (2x) - 20

= 6x - 20

perimete of a triangle = sum of all sides,

substitute the values we know,

and you'll be left with this equation

106 = x + 2x + 6x - 20

106 + 20 = 9x

126 = 9x

126/9 = x

14 = x

so,

measure of second side = x = 14 feet

measure of first side = 2x = 2 (14) = 28 feet

measure of thurd side = 6x - 20 = 6 (14) - 20 = 84 - 20 = 64 feet.