In the diagram below of triangle MNO, P is the midpoint of MO and Q is the midpoint of NO. If PQ=4x-18, and MN=99-7x, What is the measure of PQ?

In the diagram below of triangle MNO P is the midpoint of MO and Q is the midpoint of NO If PQ4x18 and MN997x What is the measure of PQ class=