Brand A is cheaper than brand B because the cost per load is $0.19 which is lesser than $0.25 for brand B.
An equation is an expression that shows the relationship between two or more numbers and variables.
Brand A laundry detergent contains enough detergent for 64 loads and costs $11.97, hence:
Cost per load = $11.97/64 = $0.19
Brand B detergent contains enough for 81 loads and costs $19.97, hence:
Cost per load = $19.97/81 = $0.25
Brand A is cheaper than brand B because the cost per load is $0.19 which is lesser than $0.25 for brand B.
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