61 - 51 = 9
9 / 60 = .15
therefore 9 is 15% of 60.
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85*60/100 = 51
85 - (40%) = 51
54.
60 - 20% = 48 or 48/1
51 questions is 85% of 60 questions. Divide 51 by 60, then multiply by 100 to get the percentage (%). 51/60 = 0.85 x 100 = 85% (you may notice that 51/60 = 17/20, and multiplying by 5/5 gives you the same answer)