Add them up.
40, 42, 44, 45, 46, 48, 49, 50
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Including 40 and 50 there are 8 composite numbers because 41, 43 and 47 are prime numbers.
These are the composite numbers between 40 and 50: 42 45 46 48 49.
40 and 50
The prime numbers between 40 and 50 are 41, 43, 47. So their sum is 131.
All even numbers between 50 and 80 are composite.