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March 16th, 2016, 02:38 PM  #1 
Senior Member Joined: Feb 2016 From: seattle Posts: 377 Thanks: 10  Not sure how to write the formula.
Twice the difference of a number and four is four. Find the number. I was thinking 2(x+4)=4 but of course it's wrong. 
March 16th, 2016, 03:04 PM  #2 
Global Moderator Joined: Dec 2006 Posts: 18,719 Thanks: 1536 
The difference between the number and four is two, so the number is either two or six.

March 16th, 2016, 03:57 PM  #3 
Senior Member Joined: Feb 2016 From: seattle Posts: 377 Thanks: 10  
March 16th, 2016, 06:01 PM  #4  
Senior Member Joined: Jul 2014 From: भारत Posts: 1,178 Thanks: 230  Quote:
x = 6 I agree with skipjack that number is either 2 or 6, but subtraction is always order–sensitive, and the question says that difference of a number and four is four, so the number has to be 6.  

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