A dinner party is to be fixed for a group of 100 persons. In this party - 50 persons do not prefer fish - 60 prefer chicken and 10 do not prefer either chicken or fish. Find the number of people who prefer both fish and chicken.

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A dinner party is to be fixed for a group of 100 persons. In this party - 50 persons do not prefer fish - 60 prefer chicken and 10 do not prefer either chicken or fish. Find the number of people who prefer both fish and chicken.