Question

a person who believes in solving human problems with the help of a reason
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Answer 1

Answer:

A person who believes in solving human problems with the help of a reason is a so-called solutionist.

Explanation:

Solutionist is a man who is incorporated enough knowledge to solve the problems

Answer 2

Answer:

Troubleshooter

Explanation:

A person who believes in solving human problems with the help of a reason is known as a Troubleshooter

We are using One word substitution -We use one word in place of the sentence. And that one word is enough to understand the meaning of the whole wordy phrase

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