document.write( "Question 138930: in a burger chain customers who use mustard are 80%, who use ketchup are 75% and who use both are 65%. what is the probability that the customers comming in the shop will use mustard, ketchup or both? \n" ); document.write( "

Algebra.Com's Answer #101353 by stanbon(75887) $\"\"$ $\"About$

You can put this solution on YOUR website!
Use Venn Diagrams:
\n" ); document.write( "Draw two overlapping circles
\n" ); document.write( "Let the intersection be 65%
\n" ); document.write( "Then the rest of the mustard circle is 15%
\n" ); document.write( "and the rest of the ketchup circle is 10%
\n" ); document.write( "Adding 65+15+10 you get 90%
\n" ); document.write( "That leaves 10% that do not use ketchup or mustard.
\n" ); document.write( "So 90% use mustarard, ketchup or both.
\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H. \n" ); document.write( "

\n" );