Average is the sum of all values over number of values.
(55+60+155)/3
270/3 = 90
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55 out of 60 is a 91.67% (A)
The LCM of 55 and 60 is: 660
That depends on what is passing grade? Is it 60%? Then 0.80 (.55) + .20 (x) = .60 .44 + .20X = .6 .20X = .16 x = .80 That means you need to get 8 of every 10 questions right to get 60 percent average.
55 of 60 can be written as a fraction (55/60) and reduced to its lowest term (11/12). Or to convert it to a decimal or percent, divide 55 ÷ 60 = .9166666 or .917% (rounded)
1 hour = 60 minutes 55/60 = 11/12