Sandra's dog gave birth to 7 puppies. Her vet gave her 105 portions of formula to give to the puppies for 5 days. How many times a day should Sandra feed the puppies?
Each day, Sandra will have 105/5 = <<105/5=21>>21 portions of formula.
Each puppy needs to be fed 21/7 = <<21/7=3>>3 times a day.
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