SAT prep question
point QQQ lies on overline {PR} PR start overline, P, R, end overline. If the length of overline{PR} PR start overline, P, R, end overline is 181818 and the length of overline{QR} QR start overline, Q, R, end overline is twice the length of overline{PQ} PQ start overline, P, Q, end overline, what is the length of overline{PQ} PQ start overline, P, Q, end overline?
