Find the next number in the series:
$57,43,29,15,\dots \dots \dots \dots$

Let's find the pattern by looking at the difference between consecutive numbers:
$$43-57=-14$$

$$29-43=-14$$

$$15-29=-14$$

The series follows an Arithmetic Progression where each subsequent term decreases by $14$.
Therefore, the next number will be:

$$15-14=1$$