1. to encourage public transportation, avery wants to give some friends envelopes with bus tickets and subway tickets in them. if she has 15 bus tickets and 10 subway tickets to split equally among the envelopes, and wants no tickets left over, what is the greatest number of envelopes avery can make?

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?