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Hi can anybody help with (a)? I'm struggling with this question

Hi can anybody help with (a)? I'm struggling with this question-example-1

1 Answer

6 votes
Answer: 26.6 mins.


Explanation: 35 mins (the mean time) x 20 adults = 700 mins in total of all adults
34.6 mins (new mean time) x 21 adults = 726.6 mins in total of all adults.

726.6 mins - 700 mins = 26.6 mins
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