Which number comes next in the series 7, 12, 17, 22, 27, ?

Explanation

1. 01

   Differences: $12 - 7 = 5$, $17 - 12 = 5$, $22 - 17 = 5$, $27 - 22 = 5$.

2. 02

   The difference is always 5, so the next term is $27 + 5 = 32$.