5) During the 10 minutes before a flight began boarding, the
most popular selling items of an airport's convenience store
were snacks, magazines, and bottles of water. The store sold
$23.50 worth of snacks, priced at $4.70 each, and twice as
many bottles of water as magazines. If, during this time, the
store sold a total of 17 of the most popular items for a total
of $63.70, how many magazines did the store sell?