The average height of 3 men P, Q, and R is 180 cm. Another man S joins the group and the average now becomes 170 cm. If another man T, whose height is 5 cm more than that of S, replaces P, then the average height of Q, R, S, and T becomes 168 cm. The height of P is:
1
140 cm
2
153 cm
3
166 cm
4
150 cm
5
186 cm