Selling vegetables and math

The old lady sells vegetables.

The man asked, how much is a catty of vegetables?

The old lady said, one yuan a catty.

The man asked again, how much is the first catty of food?

Old lady, 30 cents.

Where are the leaves?

70 cents

Ok, give me five Jin of vegetable heads and five Jin of vegetable leaves. Five Jin of vegetable leaves is 3.50 yuan, and five Jin of vegetable head 1.50 yuan. * * * Five yuan. Here you are.

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