If

6 / 7 = 2

3 / 9 = 7

8 / 2 = 6

Then

4 / 5 = ?

She was able to solve it in less than a minute. Can you?

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The answer is 0.As

6 * 7 = 42 but the answer is written as 2

3 * 9 = 27 but the answer is written as 7

8 * 2 = 16 but the answer is written as 6

If we look at the answers, the second digit has been used in the problem.

Now, as

4 * 5 = 20 and the second digit is 0, the answer is 0.