When a number $a$ is divided by 8, the remainder is 5. Which of these can $a$ be?

Explanation

1. 01

   $a \bmod 8 = 5$ means $a = 8q + 5$: 5, 13, 21, 29, 37, 45, …

2. 02

   $37 = 8 \times 4 + 5$. The others leave 3, 2 and 3.