翻译if an integer is three times as large as the sum of the figures in its digit

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• 翻译if an integer is three times as large as the sum of the figures in its digit
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• 英语翻译If we write out all the three-digit numbers with the sum of the figures on each digit equivalent to 10 ,and arrange them from great to small,then what is the tenth number in them?
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• a double-digit number plus nine times of its ones is 100.what is sum of its figures on its digits.
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• the tree must _____(water) three times a month