Three siblings sarah, dave, and kate - committed themselves to volunteer 155 hours for a homeless charity to build new housing. kate worked 10 hours more than sarah. dave worked 20 hours fewer than sarah. how many hours did each of these siblings volunteer?

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?