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Question Number 20298 by mondodotto@gmail.com last updated on 25/Aug/17

Answered by Tinkutara last updated on 25/Aug/17

$$45=36+12+18-n(\mathrm{medals}\mathrm{in}\mathrm{two}$$$$\mathrm{categories})+4$$$$n\left(\mathrm{medals}\mathrm{in}\mathrm{two}\mathrm{categories}\right)=25$$$$n\left(\mathrm{exactly}\mathrm{two}\mathrm{categories}\right)=25-3\times 4$$$$=13$$

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