If Frank creates 20 waves every 10 seconds, then how many waves does he create EVERY SECOND?

2 waves

Explanation:

If Frank creates 20 waves every second then the way you solve is turn it into a proportion 20 waves/10 secs = x/1 sec which then turns into the equation of 10x=20 where x=2 hence Franks creates 2 waves every second.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

ugh fiel iente of insistí is did kiwis jaj