Purchase
The mother bought five boxes of milk and 7 kg of potatoes and paid a total of CZK 147. Aunt bought seven boxes of milk and 3 kg of potatoes and paid 131 CZK. What is the price of one carton of milk and 1 kg of potatoes? How would CZK together have saved if bought at the supermarket, where they have the same price of milk, but the potatoes are 20% cheaper?
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