100 - 10x = 40 * a X = 6 b X = 7 c X = -6 d X = 5
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Prime numbers are those numbers which have only two factors, 1 and the number itself . For e.g. 3,5,7,11 etc are all prime numbers.
Between 110 and 130 we have a total of two prime numbers which are 113 and 127, since both have only two factors .
And sum of 113 and 127 is
So the required answer is 240 .