In a Survey of 116 Consumers Conducted in a Shopping

In a survey of 116 consumers conducted in a shopping mall, 79 consumers indicated that they buy brand A of a certain product, 64 buy brand B, and 43 buy both brands. How many consumers participating in the survey buy at least one of these brands? How many consumers participating in the survey buy exactly one of these brands? How many consumers participating in the survey buy only brand A? How many consumers participating in the survey buy none of these brands?
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__________ consumers bought at least one of these brands
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__________ consumers bought exactly one of these brands
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__________ consumers bought only brand A
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__________ consumers bought none of these brands