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.
System of equations
Is it a number?
Fibonacci-Sum of Squares
Combined Ages 4 - Non-symmetric with multiples, n ≥ 3
Is it really a 5?
Scrabble Scores - 7
Scrabble Scores - 9
Rumis Scorer 1
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