question: Josie grows grapes on her 10-acre farm.  Each acre produces 5 tons of grapes per year, and each ton of grapes makes 2 barrels of wine.  How many barrels of wine does her farm produce per year?
answer: If each acre produces 5 tons of grapes per year, then her ten-acre farm produces 10*5=<<10*5=50>>50 tons of grapes per year.
  If each ton of grapes makes 2 barrels of wine, then 50 tons makes 2*50=<<50*2=100>>100 barrels of wine per year.
  #### 100