((PLEASE HELP URGENT))
Points P, Q R, and S are collinear Point Q is between P and R. R is between Q and S, and PQ=RS, If PS = 27 and PR= 21, what is the value of QR? ​

PLEASE HELP URGENTPoints P Q R and S are collinear Point Q is between P and R R is between Q and S and PQRS If PS 27 and PR 21 what is the value of QR class=