You can get 6 of each with a good piece left.
Cut 7.5" x 22" off one side and subcut to 6 pieces 3.5"x7.5". (6x3.5=21" - you will have at least 1" left over at the bottom.)
You have 10.5"x22" remaining. Cut two pieces that are 7.5x10.5, subcut each into 3 pieces that are 3.5x7.5.
You will have 7"x10.5" remaining. You could make more of one type of block with these, and if your FQs happen to be 22.5" instead of 22", you could make more of either type.