62.5% or 5 correct
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With 3 wrongs out of 8 questions your average is (3/8)x100 = 37.5% wrong and 62.5 correct.
0.375
8 wrong i.e. 32 right 10% of 40 is 4 80% = 8 x 4 = 32 40 - 32 = 8
toget 80% you need .8 x 15 = 12 questions right. That means you can 15-12 = 3 questions wrong
4 - 3/8 = 32/8 - 3/8 = 29/8 = 35/84 - 3/8 = 32/8 - 3/8 = 29/8 = 35/84 - 3/8 = 32/8 - 3/8 = 29/8 = 35/84 - 3/8 = 32/8 - 3/8 = 29/8 = 35/8