A trainer gives his horse Carlos 7 gallons of water everyday from a 57 gallon container. How many days will Carlos receive his full portion of water from the container?

Question

A trainer gives his horse Calabro 7 gallons of water every day from a 57 gallon container, How many days will Calabro receive his full portion of water for the container, On which day will the trainer need to refill the container?

Answer 1

57=8×7+1, so he can supply 8 days of water and then refill on the 9th day.