SOLUTION: The sum of the composite numbers between 20 and 30,minus the sum of the sum of the prime numbers

Algebra ->  Divisibility and Prime Numbers -> SOLUTION: The sum of the composite numbers between 20 and 30,minus the sum of the sum of the prime numbers      Log On


   

Question 854313: The sum of the composite numbers between 20 and 30,minus the sum of the sum of the prime numbers
Answer by LinnW(1048) About Me  (Show Source):
You can put this solution on YOUR website!
Composite numbers between 20 and 30 are
20 21 22 24 25 26 27 28 30
There sum is 20+21+22+24+25+26+27+28+30 = 223
Prime numbers between 20 and 30
23 29
Their sum is 23+29 = 52
223 - 52 = 171