###Human: James buys pistachios for $10 per can.  Each can is 5 ounces.  He eats 30 ounces of pistachios every 5 days.  How much does he spend on pistachios per week?, ### Assistant: The pistachios cost 10/5=$2 per ounce
He eats 30/5=6 ounces of pistachios a day
So he spends 6*2=$12 per day on pistachios
So he spends 12*7=$84 per week 
 So the answer is :  84