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ابحث أولاً عن العدد الإجمالي للعناصر في السطح Bolsheviks لقطع العناصر المفيدة العدد قسماً على نسبة العناصر المفيدة : 8 عناصر/.2 = 40 عنصر.
ثم اضرب العدد الإجمالي للعناصر في النسبة المتمثلة في القمامة للعثور على عدد عناصر القمامة : 40 عنصر * .7 = 28 عنصر.
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