The perimeter of an isosceles triangle is 36 centimeters and

The perimeter of an isosceles triangle is 36 centimeters and two sides of the triangle are in the ratio 1:4. What is the number of centimeters in the length of the longest side?

 

The ratio of all 3 sides is 1:4:4

 

36/9 = 4          triangle sides are:  4, 16, 16