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20% of overall=assign1
80% of overall=assign2
120 marks needed to pass, got 100 percent of marks in 20% assignment so 300*.2=60
so we need to get 60 more marks
so 300-120=180 and we need to get 60/180=.33333333 so we need 33.3333 marks from the 100
this is because the total is 300 and 20% is at 100% = 60 marks, so we still need 60 since we need 120. there are still 180 marks so we need 60/180, which is 1/3, and out of 100 thats 33.333333 marks.
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