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Monday, October 23 2017 @ 06:43 AM CDT
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By: sundarshoba (offline)  Sunday, August 03 2014 @ 05:50 AM CDT (Read 1352 times)  
sundarshoba

Please assist to solve,

60% of the total number of pens is either blue or black. 75%of the same total number of pens is either red or black. What percentage of the pens is black?

I doubt there is something wrong in the question? Please confirm

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By: echeewh (offline)  Sunday, August 03 2014 @ 06:07 PM CDT  
echeewh

Hi < sundarshoba >

Following is my worked solution:

B/BK = 60% Total
i.e. the remaining 40% Total makes up Red (R) pens.

Given that 75% of the same total number of pens is either red (R) or black (BK),
and since R makes up 40% of the same total, we have ...

% BK = 75% - 40% = 35%

======

Trust this helps.

Do let me know again if this is different from your <Answerkey> or if there's further clarification.

Cheers,
Edward

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