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**Hint**: First step in every Ratio numerical is to check if it is in the reduced form or not. We should then proceed with other operations like Multiplication addition. This would make the problem very easy to solve.

**:**

__Complete step-by-step answer__From the given problem we can see that the ratio is not in its simplest form. Everytime we get a ratio $ 1st $ Step would be to convert it into the simplest form and then move ahead.

In order to reduce it to the simplest form we will have to find a common factor and then start reducing.

Given Ratio: $ 63:36 $

As we can see from the above given ratio that $ 63 $ and $ 36 $ have the highest common factor of 9. In order to bring it to the simplest form we will divide $ 63 $ and $ 36 $ by $ 9 $

$ \Rightarrow 63 \div 9 = 7..........(1) $

$ \Rightarrow 36 \div 9 = 4...........(2) $

From $ Equation1 $ and $ Equation $ we can see that we have reduced $ 63 $ and $ 36 $ to its simplest form.

Thus our new ratio becomes $ 7:4 $

From the question we have to enter $ 1 $ if the simplest form turns out to be $ 7:5 $ .

Since our solution is $ 7:4 $ we will have to enter another option i.e $ 0 $ .

Thus our answer for the given problem is $ 0 $

**So, the correct answer is “0”.**

**Note**: In order to solve the Problems related to Ratio and Proportion it is advisable to learn the Tables from 1 to 15 in order to make the sum much easier. It would help to reduce the ratio to its simplest form very fast.

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