Apples investment

The merchant bought a certain amount of apples and paid 1 denarius for every 7 apples. The next day he sold all the apples for 1 denarius for 5 pieces and earned 12 denarii. How many apples did he originally buy and how many did he have to invest in this business?

Correct answer:

x =  210
y =  30

Step-by-step explanation:

1/5 x1/7 x=12  2x=420  x=210
y=1/7 x=1/7 210=30

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