Of the fifth-grade students, 20/25 went to the book fair. of the students that went to the book fair, 8/10 bought at least one book. what fraction of students bought at least one book?

It is saturday morning and jeremy has discovered he has a leak coming from the water heater in his attic. since plumbers charge extra to come out on the weekends, jeremy is planning to use buckets to catch the dripping water. he places a bucket under the drip and steps outside to walk the dog. in half an hour the bucket is 1/5 of the way full. what is the rate at which the water is leaking per hour?