Answer:
see explanation
Step-by-step explanation:
The set of the first few prime numbers are
2, 3, 7, 11, 13, 17, 19, 23 ...............
Considering the odd primes, then
24 = 7 + 17
36 = 13 + 23
t.uy
a=20
7+13=20
20-7=13
probably 57 will be the answer
