How do i solve this fraction word problem?

there are 24 children in a kindergarten class. three-quarters of them can already write the whole alphabet. how many children can write the alphabet?

Sarah took the advertising department from her company on a round trip to meet with a potential client. including sarah a total of 11 people took the trip. she was able to purchase coach tickets for $280 and first class tickets for $1280. she used her total budget for airfare for the trip, which was $6080. how many first class tickets did she buy? how many coach tickets did she buy?