Sneha did a math magic with her friend Kriti. She asked her to think of a twodigit number. Then she asked her to add the digits of the number and then
multiply the sum by 5. She asked her to add 5 to the product and multiply the
result by 2. Then she asked her to divide the result by 10 and to subtract the sum
of the digits from this number. Sneha told Kriti that number left is 1. Kriti is
amazed. Can you help Kriti to understand this magic?
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