The number of gallons of gas that were in the tank plus 13 more adds up to 16 gallons

2-digit numbers less than 91 which are 1 less than a multiple of 10

Fa bus driver leaves her first stop by 7: 00 a.m., her route will take less than 37 minutes. if she leaves after 7: 00 a.m., she estimates that the same route will take no less than 42 minutes. which inequality represents the time it takes to drive the route, r?

How can constraints be used to model a real-world situation?