Question

If it rained on 3 days out of 20 days, on what percent of the days it rain?

Answer 1

3 days rained
20 days total
therefore
% of days rained = # of days rained/ days total
% of days rained = 3/20
% of days rained = 0.15 or 15%

thus, % of days rained is 15%

hope this helps :P