The mean of five numbers is 8. when another number is added the mean is 7. find the number added

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?

Fast! find the length of cu. the triangles are similar. show your work.

How can writing phrases as algebraic expressions you solve problems?