Сравните дроби:4/15и 11/60; 11/20и8/15; 5/9и 6/7.

4/15 > 11/60 (т.к 4/15 = 16/60, 16/60 > 11/60) 
11/20 > 8/15 (т.к 11/20 = 33/60, 8/15 = 32/60, 33/60 > 32/60) 
5/9 < 6/7 (т.к 5/9 = 35/63, 6/7 = 54/63, 35/63 < 54/63)

4/15> 11/60
11/20> 8/15
5/9< 6/7