Complete the series: 20,5,30,6, ______

Complete the series: 20,5,30,6, ______

Explanation

The larger numbers are multiples of the smaller numbers before and after.


... 4 20 5 30 6 42 7 56 ...


4 x 5 = 20


5 x 6 = 30


6 x 7 = 42