Write the sentence as an equation then solve ; 5 less than one half of a number n is 21

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

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?

Ineed with this problem 21 show steps