SOLUTION: And observation study was carried out of supermarket.out of these surveyed,140 had bought a scone,and 100 had bought a bar,10 had bought a bar and a scone,and 30 had bought neither

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Question 1092489: And observation study was carried out of supermarket.out of these surveyed,140 had bought a scone,and 100 had bought a bar,10 had bought a bar and a scone,and 30 had bought neither a bar nor scone
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