If four two digit prime numbers a, B, C and D are different and satisfy the equation a + B = C + D, then what is the minimum possible value of (1) a + B? (2) What is the maximum possible value of a + B?

(1) There may be the possibility of 13 + 17 = 11 + 19, 23 + 27 = 21 + 29, 13 + 27 = 11 + 29, 23 + 17 = 21 + 19 and so on. But because a + B needs to be the smallest, 13 + 17 = 11 + 19 is the best combination when a, B, C and D are all greater than 10, that is, a + B = 30. (2) the two largest prime numbers are: 71, 79, 89, 97

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