In trapezoid PQRS, PQ is parallel to RS. Let X be the intersection of diagonals PR and QS. The area of triangle PQX is 20 and the area of triangle RSX is 45. Find the area of trapezoid PQRS.
https://latex.artofproblemsolving.com/3/5/6/35649f04fdfd69ee119669999e5d39f4c511d5d8.png