For three consecutive odd numbers, three times the smallest is 7 more than twice the largest. What is the middle number?

Explanation

1. 01

   Let them be $x, x + 2, x + 4$: $3x = 2(x + 4) + 7$.

2. 02

   $3x = 2x + 15$, so $x = 15$.

3. 03

   The numbers are 15, 17, 19; the middle one is 17.