Onion white is 50 catties, green onion is 50 catties

Onion white 7*50=350 (hair) Green green 3*50=150 (hair) 35150=500 (hair)

p>

500 gross = 50 yuan

Answer: 50 pounds of white scallions plus 50 pounds of green scallions equals 50 yuan.

The onion seller sells white scallions for 7 cents, which is cheaper, 30 cents, and green scallions for 30 cents, which is cheaper, 7 cents, which is exactly half the price difference.

Put white scallions and green scallions at 30 cents Think of it as half of a green onion, buy one for 7 cents, buy a catty for 30 cents, which is equivalent to one yuan, buy two catties