ANSWERS: 5
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73
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Is it 73?
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71 or 73
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Those are the prime numbers greater than 40 and less than 90: 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89 http://en.wikipedia.org/wiki/Prime_numbers If the tens digit is a prime, it cannot be 4, 6, 8 and 9. So you stay with: 53, 59, 71, 73, 79 As the ones numbers 1 and 9 are not primes, you stay with: 53, 73 As 5-3=2 but 7-3<>2, the solution is 73.
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73! And I worked it out all by myself!
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