Next number in the sequence ? 15, 31 . 48 ,66 ,85

The sequence appears to be increasing by an increasing amount each time. Let's break it down:

• The difference between 31 and 15 is 16.
• The difference between 48 and 31 is 17.
• The difference between 66 and 48 is 18.
• The difference between 85 and 66 is 19.

So, the difference between each pair of numbers is increasing by 1 each time. If we continue this pattern, the difference between the next number and 85 should be 20.

Therefore, the next number in the sequence would be 85 + 20 = 105.