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.
Add two numbers
Find the two-word state names
vectorization in N
Duplicate each element of a vector.
Calculate the height of an object dropped from the sky
Word Distance - Average Sort
Lights Out 3 - 5x5, 6 moves
Rule of mixtures (composites) - other bound
Divisible by 12
Temperature Conversion Utility (Strings)
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