Jose has a bowl of M&Ms. He picks out all of the blue M&Ms first, because they are his favorite. He then picks out all of the green M&Ms and eats them. The green M&Ms are his second favorite. He ate 9 times as many blue M&Ms as green M&Ms. How many blue and green M&Ms could have been in his bowl? What other possibilities of green and blue M&Ms could Jose have in his bowl? Show your thinking with a model and an equation with a symbol for the unknown.