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.
Bottles of beer
Volume of a Parallelepiped
06 - Matrix Equations 1
Divisible by 9
Replace secondary diagonal elements of a square array
Rule of mixtures (composites) - either bound
Lights Out 3 - 5x5, 6 moves
Divisible by 10
I Plead the Fifth
Musical Note Interval 1 - Diatonic Scale
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