Assuming you want letter grades, in the US, most schools would consider that a "B".
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85% of 140 test tubes= 85% * 140= 0.85 * 140= 119 test tubes
what you do is you divide 100 by the amount the test was out of then times your answer by your mark
20-3 = 17 and 17/20 = 85/100 = .85 or 85%. Percent is a ratio per cent or 100. Multiplying both the 20 and the 17 by 5 will make the denominator 100 and the percent sought after.
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27 percent of 85 is 22.95.