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Combined average

(18)/100 = 18% ; 5/(50)=10% ; why when the two numbers added together (13)/50 = 26%?  I thought the answer should be anywhere between 10% to 18%?

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2 Answers

Your question has a mistake.

18/100 = 9/50

Therefore, if you add 9/50 + 5/50 it gives 14/50(not 13/50). This is the same as 28%.

This is the sum of the number and the sum of %. Not average.

Average is (9/50 + 5/50 )/2 = 7/50 = 14%.

 

 

It's the average that is between 10% to 18%, not the sum. The sum of 10% and 18% is 28%, not 26%.