Read this and answer the question. If the question is unanswerable, say "unanswerable".

Often 'b' & 'p' are interchangeable, for example 'baggage' becomes 'pagas', 'lob' (to throw) becomes 'loopima'. The initial letter 's' is often dropped, for example 'skool' becomes 'kool', 'stool' becomes 'tool'.

What word does Tool become when you apply the interchangeable rule?
unanswerable