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 November 1st, 2018, 10:05 PM #1 Senior Member   Joined: Aug 2014 From: India Posts: 343 Thanks: 1 How to solve percentage problem based on marks? In an examination, 80% of the boys passed in English and 85% passed in mathematics, while 75% passed in both. If 45 boys failed in both. The number of boys who sat for the examination was. Number of Boys pass % in English = 80% Number of Boys pass % in Maths = 75% Boys who passed in both English & Maths = 75% After this how to proceed?
 November 2nd, 2018, 01:24 AM #2 Senior Member   Joined: Apr 2014 From: UK Posts: 895 Thanks: 328 I'd start by working out what % failed both, since we have that as an actual number of boys. Since 80% passed English and 75% passed both, 5% passed English only. Since 85% passed Maths and 75% passed both, 10% passed Maths only. So, the % of boys who passed neither is All the boys minus those who passed both minus those who passed only one of the subjects: 100% - 75% - 5% - 10% = 10% The next step should be easy....

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