How to find a fraction between the fractions 14/20 and 15/20

You can double the fractions, so instead of 14/20 and 15/20 you have 28/40 and 30/40. The fractions still equal the same amount. Between theses two new fractions is the fraction 29/40.

So, 29/40 is between 14/20 and 15/20.