3 points on a line Q,P,R (In order)

Question

if QP =2x
and QR =2x+1
and PR =21
Solve for x

Answer 1

QP + PR = QR

2x + 21 = 2x + 1

However, this doesn't make sense, since subtracting 2x from both sides gives you 21 = 1. Do you have typos?

Answer 2

Indicate your subject in the "School Subject" box, so those with expertise in the area will respond to the question.

Answer 3

reply to PSYDAG
Typos
I was told no
but I think yes