Number of incorrect answers: (10× 8-64) ÷ (10+6) =1.
Number of correct answers: 8- 1=7.
(2)
Number of incorrect answers: (10×10-36) ÷ (10+6) = 4.
(3)
Number of wrong answers: (10×16-16) ÷ (10+6) = 9.
Number of correct answers: 16-9=7.