Same issue here as in your third problem. Please check the absolute value of the differences of the computed values with the correct ones. Otherwise, more silly answers (again, like this one :-) will slip through!
Thanks for the catch. I've updated the test suite to check against upper and lower bounds of each answer.
Back to basics 15 - classes
Sum of diagonal of a square matrix
subtract central cross
Length of the hypotenuse
Mersenne Primes vs. All Primes
Word Distance - Sum
Rumis Scorer 1
Rule of mixtures (composites) - upper bound
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