Mathematical pattern problem 4 / 5 = ?

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In an entrance test, Deepika came across a mathematical pattern problem.
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?

Click here for Answer

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.

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