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Delicious77 [7]
3 years ago
12

The track coach tells Dave that he still has 80% of his workout left. Dave has run 4 laps so far.

Mathematics
1 answer:
Tpy6a [65]3 years ago
7 0
20% equals 4
80% divided by 20% is 4
4x4=16

he has 16 laps left
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Since we have a total of 8 locations ( 4 to the new ointment and 4 to the control) ,  each one can be chosen and since the order of the locations that are chosen for the new ointment is not relevant  , then we know that the number of choices is given by the number of combinations of 4 elements in 8

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