Mother bought three balls and paid 50 yuan. How much should I get back?

◆ You didn't finish asking. How much is a ball? This is the key known condition.

Suppose the price of one ball is one yuan, then three balls are three yuan. When my mother goes out of 50 yuan, the amount of money she should get back is:

X=50-3A

For example, A= 10 yuan, you should get back 50-3A=50-30=20 yuan.

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