108 in 6 weeks can be expressed as 6/108. To find the unit rate, we need to make that 6 into a 1. What can we do to get from 6 to 1? Divide by 6. Whatever we do to the numerator must be done to the denominator, so you need to make the denominator the answer of 108/6. 108 divided by 6 = 18.
The unit rate is 1/18.
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