Points​ P, Q,​ R, and S are collinear. Point Q is between P and​ R, R is between Q and​ S, and . If PS = 25 and PR​ = 18, what is the value of​ QR?

Answer 1

PS = 25

PR = 18

PQRS are in that order

what is QR?

0<QR<18

IF QR = 9, being exactly midway between P and R

then PQ=QR = 9

and RS =25-18 = 7

IF R is exactly midway between Q and S

then QR=RS = 7 and PQ = 11

without more information that's about all you can determine