the sum of digit of a 2-digit number is 9. If 27 is subtracted from the number we get 2-digit number with the sequence of digit changed. Find the number.
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If each resident has to follow certain rules to maintain a clean neighbourhood, Immediately clean up all messes in their surrounding. Firstly "Say NO to plastic bags use", it will help to reduce the pollution. Spend a day cleaning your home for at least 10-15 minutes. Keep a box for items you don't need or use anymore.
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