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75% right, 25% wrong.
a 93 good job :)
90% of 80 right means 10% of 80 wrong, which means 10/100 x 80 = 1/10 x 80 = 1/1 x 8 = 8 questions wrong.
45.4545.. % wrong.
x/30 = 1-0.87= .13 x = 30 x .13 = 4 questions wrong 26 question right = 26/30 =.87 = 87% right