question: speed:time:distance
choices.label: A B C D
choices.text: interest rate:principal:interest quality:variety:quantity profit:cost:output value income:expenditure:surplus
explanation: "speed" times "time" equals "distance". the "interest rate" multiplied by the "principal" equals the "interest". there is no obvious logic between "quality", "variety" and "quantity". the product of "profit" multiplied by "cost" is not "output value". "surplus" is the difference between "income" and "expenditure".
relation: speed time distance R3.10
relation: interest rate principal interest R3.10