<human>:  Aunt Gemma has four dogs. She feeds them with dog food twice a day. Each dog can consume 250 grams of food per meal. If aunt Gemma bought 2 sacks of dog food, each weighing 50 kilograms, how many days will those food last?
<bot>: How many grams of dog food does each dog consume each day? ** Each dog consumes 250 grams x 2 = <<250*2=500>>500 grams of dog food each day.
How many grams of dog food do the dogs consume each day? ** So, 4 dogs consume 500 grams x 4 = <<500*4=2000>>2000 grams of dog food each day.
How many kilograms of dog food can the dogs consume each day? ** Since there are 1000 grams in 1 kilogram, then the 4 dogs can consume 2000/1000 = <<2000/1000=2>>2 kilograms of dog food each day.
How many kilograms of dog food did aunt Gemma buy? ** Aunt Gemma bought a total of 50 kilograms x 2 = <<50*2=100>>100 kilograms of dog food.
How many days will the dog food last? ** Hence, it will last 100 kilograms/2 kilograms = <<100/2=50>>50 days.
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