At the grocery store, Luke buys a bag of fruit. The bag weighs a total of 27 ounces. There are 6 bananas in the bag, and the remaining fruit weighs 9 ounces. Write an equation that can be used to determine b, the weight in ounces, of one banana.
1. Sketch a model of the equation
2. Explain how to use the model to determine the value of b
3. What the is the weight of one banana