Final answer:
Gary would have to play 67 hours to reach the maximum rank at level 155.
Step-by-step explanation:
To calculate the number of hours Gary would have to play to reach the maximum rank at level 155, we can set up a proportion.
We know that he reached level 55 in 22 hours, so we can set up the proportion: 55/22 = 155/x.
To solve for x, we cross-multiply and get: 55x = 22 * 155.
Dividing both sides by 22, we find that x = 67. So, Gary would have to play 67 hours to reach the maximum rank at level 155.