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If there are exactly 5 times as many children as adults at a show, which of the following cannot be the number of people at the show?

a) 102

b) 80

c) 36

d) 30

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a) 102

b) 80

c) 36

d) 30

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a=5a

therefore, the number of people in the show would be represented by:

5a+a or 6a

Therefore, 80 cannot be the number of people in the show because it is not divisible by 6