what two digit whole number is twice the product of its digits?

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• what two digit whole number is twice the product of its digits?
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• sat数学.题目看不懂..Tim wrote a seven-digit phone number on a piece of paper.He later tore the paper accidentally and the last two digit were lost．What is the maximum number of arrangements of two digits,using the digits 0 through 9,that he could use in attempting to reconstruct the correct phone number?
• 数学应用题(英文的)Can you guess this number? The number is not an odd number.o It has exactly four factors.o If you reverse the digits,a prime number is formed.o The sum of the digits is a two digit prime number.o The number is less than the square root of 104.o One of the digits is a square number.What number are we thinking of?
• what two digit whole number is twice the product of its digits?
• a double-digit number plus nine times of its ones is 100.what is sum of its figures on its digits.要结果
• 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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