what does this sentence mean?thank you.
I remind them to start with 100% and work backward. If they got 60% on a midterm worth 30 points of their total grade, then they still have an 88 in total.

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Thanks for posting 小二的歌!

It's looks like advice given by a teacher to their students. They are saying that it's best for students to have a 100% average before taking their exam. Their logic is that even if the student only get's a 60% score on the exam, their overall average would still be 88%.

I hope that helps!

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