Jane made a 7 foot by 5 foot ?

Jane made a 7 foot by 5 foot rectangular patchwork quilt consisting of red, blue, yellow, and green squares that each measure 1 foot by 1 foot on the finished quilt. she used twice as many green squares as red and 1 more blue square than yellow. If Jane used 9 blue squares, how many green squares were used? please explain how you did it