Final answer:
To find PT, set up the equation SP + PT = ST and solve for x. Substituting the value of x into PT gives the answer.
Step-by-step explanation:
To find PT, we need to first set up an equation using the given information.
Since P is between S and T, we know that SP plus PT equals ST.
So, we can set up the equation 20x - 1 + 5x + 12 = 211. Simplifying this equation gives us 25x + 11 = 211.
Solving for x, we find x = 8. Substituting this value back into the expression for PT, we get PT = 5(8) + 12 = 52.