if thr mechanic says that it will take seven days to repair your car, then it will actually take ten days. The mechanic says, "I figure it'll take a week to fix it." Then you can expect it to be ready ten days from now. I don't understand how this would be deductive reasoning.

Answer 1

a week is 7 days.
Now look at the first sentence.

Kind of a trivial example, but you have to deduce that

He says a week.
I know he takes 10 days when he says 7.
A week is 7 days, so it will take 10.