You and five friends are planning a trip. You want to keep the cost less than $85 per person.

You and five friends are planning a trip. You want to keep the cost less than $85 per person.

You and five friends means you have: 5 + 1 = 6 people.

If you want a cost per person less than 85, then we have a cost c such that:
c/6 < 85