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In a quality control survey 4.5% of all parts of a machine were declared sub-standard. If there were 81 sub-standard parts, how many...

      

In a quality control survey 4.5% of all parts of a machine were declared sub-standard. If there were 81 sub-standard parts, how many parts were analysed?

  

Answers


John
4.5%=81
100%=?
Cross and multiply
81×100/4.5=1800 machines were analysed

Jonmhumble answered the question on October 28, 2017 at 08:36

John
50-35=15
%increase=increase/original number×100
15/35×100=42.86%
Jonmhumble answered the question on October 28, 2017 at 08:40


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