It is: 47
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47 is the greatest prime number under 50.
29
89.
The greatest number that is less than 30 is 29.Becuase the only prime numbers that are less then 100 are:2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,59,61,67,71,73,79,83,89 and 97.So as you seen the greatest number that is less than 30 is 29.
Divide it with primes less than half of the number.