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Question Number 130899 by greg_ed last updated on 30/Jan/21

$$\mathrm{There}\mathrm{are}20\mathrm{persons}\mathrm{at}\mathrm{a}\mathrm{party}.$$$$\mathrm{Maria}\mathrm{dansed}\mathrm{with}7\mathrm{boys},$$$$\mathrm{Stacy}\mathrm{dansed}\mathrm{with}8\mathrm{boys},$$$$\mathrm{Monia}\mathrm{dansed}\mathrm{with}9\mathrm{boys}\mathrm{and}$$$$\mathrm{Eve}\mathrm{dansed}\mathrm{with}\mathrm{all}\mathrm{the}\mathrm{boys}\mathrm{at}\mathrm{the}\mathrm{party}.$$$$\mathbf{How}\mathbf{many}\mathbf{girls}\mathbf{are}\mathbf{there}\mathbf{at}\mathbf{the}\mathbf{party}?$$

Commented by mr W last updated on 30/Jan/21

$$atleast4$$$$atmost11$$

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