To find out how many loads of laundry Heather can complete with one carton of detergent, you need to divide the total ounces of detergent by the ounces used per load.
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Convert 2 1/2 ounces to a decimal: \[ 2 \frac{1}{2} = 2 + \frac{1}{2} = 2 + 0.5 = 2.5 , \text{ounces} \]
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Divide the total ounces of detergent by the ounces used per load: \[ \frac{195 , \text{ounces}}{2.5 , \text{ounces/load}} = 78 , \text{loads} \]
So, Heather can complete 78 loads of laundry with one carton of detergent.