Question: A gumball machine has red, green, and blue gumballs. The machine has half as many blue gumballs as red gumballs. For each blue gumball, the machine has 4 times as many green gumballs. If the machine has 16 red gumballs how many gumballs are in the machine?
Find the solution. 
Answer: 
There are 16/2=8 blue gumballs.
There are 8*4=32 green gumballs.
There are 16+32+8=56 total gumballs.