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The question:
nǐ zhīdào lǐ lǎoshī de diàn huà hào mǎ mǎ
你住到李老师的电话号码吗?
你住到李老师的电话号码吗?
The class’s response:
hǎo de hěn
好的很
The explanation:
The question is asking if we know Li Laoshi’s phone number. The word for number, hao4 号 is one tone off from hao3 好 meaning “good”. Add in two ma’s, and…well, you can see how one might arrive at such an answer.
Hopefully.