(don’t answer if you don’t know it) will give brainliest

Ineed with number 17 i don’t get it at alll

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?

Which number completes the inequality? 2/3 < _ < 7/9