First note that it is easier to find number of pairs such that is divisible by 24.
There are 10 primes less than 30.So in total we have 10*10=100 pairs of primes.
Next we find pairs with the desired property.
It is quite obvious that .......(*)
If 24 divides the above summation then both 3 and 8 divide the summation.
Suppose (mod 3) (mod 3),which is not possible.
This also implies . We make use of this property that q is odd later.
Consider following cases:
Case I: (mod 8)
(mod 8) [From Equation (*)]
This along with Equation (1) gives p=17 and q=5,13,29
Case II: (mod 8)
This along with Equation (1) gives p=11 and q=5,13,17,29
Case III: (mod 8)
This along with Equation (1) gives p=5,29 and q=5,13,29
Case IV: (mod 8)
This along with equation (1) gives p=23 and q=3,5,7,11,13,17,19,23,29
Total number of pairs=22
So your answer would be 100-22=78.
Please note that if p and q are taken to be distinct,then answer would be (10)(9)-(19)=71.
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