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Of the 43 people, 23 answered the first question correctly.

Twenty people got the first question wrong.

Second, among the 24 people who did the second question, they can be analyzed according to two extreme situations.

& lt 1 & gt; 23 people answered the first question correctly, and all the second questions were answered correctly. Then both questions were answered correctly, up to 23 people.

& lt2> Of the 20 people who made a mistake in the first question and got all the second questions right, the other four were sure that the first question was right, so at least four people got both questions right.

In terms of number, 4-23 people.

As a percentage, it means 9.3%-53.5%.