Use reasoning to answer the following question.
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?

3
Each day, Sandra will have 105 / 5 = 21 portions of formula.

Each puppy needs to be fed 21 / 7 = 3 times a day.

.

The answer is 3