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02-05-2017
Mathematics

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Of 40 teachers surveyed, 34 said they listen to classical music and 17 said they listen to opera. Eleven of the teachers said they listen to both classical music and opera. How many teachers listen to classical music, but not to opera?

Respuesta :

02-05-2017

6 opera + 23 classical + 11 both = 40
Answer 23

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