Ten points for one question, six points for one question, and how to calculate the last 64 points?

Mathematics problems in the fourth grade of primary school

It is stipulated that 10 points will be added for answering a question correctly, and 6 points will be deducted for answering a question incorrectly. The existing people answered 8 questions in a hurry and finally got 64 points. Answered several questions correctly.

8-( 10×8-64)÷( 10+6)

=8-(80-64)÷ 16

=8- 16÷ 16

=7 questions

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