In the pencil box, the ratio of pencils to pens is 5: 6.if there are 36 pens, how many pencils are there?

Based on what i know about mean, this doesn't add up.

Apatient is to take 60 mg of an antibiotic on day 1, take 45mg on days 2 and 3, take 30mg on days 4 and 5 and take 15 mg on days 6 and 7. how many total mg will the patient take?

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u