There were 12 boys and 20 girls in a chorus.
what is the ratio of boys to girls?
3 : 8
3 : 5
5 : 8
5 : 3

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?