56 : 7 : 2 * 5 =

Let's solve this step by step:

1. First, we divide 56 by 7: $$56 : 7 = 8$$.
2. Then, we divide the result by 2: $$8 : 2 = 4$$.
3. Finally, we multiply the result by 5: $$4 \cdot 5 = 20$$.

Answer: 20