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