The McDonald family has agreed to let their children get some animals. The kids said they want chickens and goats, so the parents told them the number of chickens could be four times that of the number of goats. They are allowed to have no more than 20 total animals. What are the possible number of chickens that the kids are allowed to

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Q: what expression would be equivalent to?

A: If you have any problem let me know here in comment box for this thankyou.