23 7. A tank contains fifteen fish of which ten are bi-coloured and twelve are goldfish. Assuming all fish are either bi-coloured or goldfish, determine:
23 7. A tank contains fifteen fish of which ten are bi-coloured and twelve are goldfish. Assuming all fish are either bi-coloured or goldfish, determine: a) the number of bi-coloured goldfish b) the number of solid coloured fish c) the number of non-goldfish
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