Using three different purchases you can determine the cost of each grain. It helps to have students know some simple steps to set up and solve systems of equations. The first thing to do is have students read the problem. Have the students identify the variables that will be used in the equations. Have the students write equations based on the information in the problem.
Someone wanting to order some corn, wheat and sorghum wants to know the cost of a bushel of each.
You can't find any information, only 3 different orders already placed and they don't contain the per bushel cost either. So now you have to use the information that is provided in the three sales receipts to determine the per bushel cost of corn, wheat and sorghum. Now add equations 4 and 5.