Question 1066315

The sum of the lengths of any two sides of a triangle must be greater than the third side. If a triangle has one side that is 21 cm and a second side that is 3 cm less than twice the third side, what are the possible lengths for the second and third sides? 
<pre>{{{highlight_green(matrix(1,6, 8, "<", Third, side, "<", 24))}}}