90+10 divided by 2=50
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[(100x60) + (Tx40)]/100=Average, where T is you average on the other 40% of your grade. Example: your grade average is 90 before the test. You get a 100 on the big test. [(100x60) + 90x40)]/100 = [6000 + 3600]/100 = 96
If all three tests are worth the same amount of the final grade,then your average is 83.3 percent.We hope it's not in Math.
10% of 90 = 990% 0f 10 = 9(10% of 90) + (90% of 10) = 18
64%
90% of 10 = 0.90 x 10 = 980% of 90% of 10 = 0.80 x 9 = 7.2