If you just want instances of questions you can keep it simple. How about
something isomorphic to
data Instance = Instance { question : String, answer : String, check : String
-> Bool }
You could make helper functions similar to your old code, like
addition : (Int , Int) -> Instance
You might handle problem families by taking a random number generator, or maybe
using QuickCheck's Gen monad.
easyMultiplication : Gen Instance
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