Need help on math plz help

For each proportion find the unknown number x 1/5/8=×/15

The dolphins at the webster are fed 1/2 of a bucket of fish each day the sea otters are fed 1/2 as much fish as the dolphins how many buckets of fish are the sea fed each day? simplify you answer and write it as a proper fraction or as a whole or mixed number

Solve 17= -13 - 8x and show your work.