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Q: How can two 2 digit numbers that are the same equal 12?

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There are five such numbers.

Write them as decimals, and compare. If the first digit of two numbers is equal, compare the second digit; if the second digit is equal, compare the third digit, etc.

93 and 42

2,4,6,8,10,12,14,16,18

Two (or four) digits added together cannot equal 42. Two-digit numbers multiplied together cannot equal 82.

11, 22, 36 and 84

89 x 90 = 8010 which are two consecutive two digit numbers that equal 8010.

The greatest two-digit prime number is 97. The lowest two-digit prime number is 11. The product of the two numbers is equal to 1067.

70 and 90

The same as the number of two-digit numbers, since the last two digits must the same as the first two, only reversed. So I'll say there are 100 four-digit palindromes.

25 and 36 are each equal to their rightmost digit squared. 25 = 5 X 5 36 = 6 X 6

The same as the number of two-digit numbers, since the last two digits must the same as the first two, only reversed. So I'll say there are 100 four-digit palindromes.

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