A group of 40 people were asked whether they like tennis and football. The number liking both tennis and football was 3 times the number liking only tennis. Adding 3 to the number liking only tennis and doubling the answer equals the number of people liking only football. 4 of them said they didn't like any sport at all communicates clearly. Find n(TnF)
and how many people like only tennis and football
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sorry I didn't know this
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