Based on the fact that Ravi has to brush a certain amount of times, he most likely suffers from obsessive-compulsive disorder.
When a person has OCD, they will engage in repetitive actions because they believe that not doing so can lead to further problems.
Ravi therefore engages in the repetitive action of brushing a certain number of times, because if he doesn't do so, something bad might happen.
Find out more on obsessive-compulsive disorder at https://brainly.com/question/7578271.
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