document.write( "Question 1128988: On​ Monday, Harold picked up six donuts and five large coffees for the office staff. He paid $ 6.86 .  On​ Tuesday, Melinda picked up two donuts and four large coffees for the office staff. She paid $ 4.06 .  What is the cost of one​ donut? What is the cost of one large​ coffee? \n" ); document.write( "
Algebra.Com's Answer #745529 by stanbon(75887)\"\" \"About 
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On​ Monday, Harold picked up six donuts and five large coffees for the office staff. He paid $ 6.86 .  On​ Tuesday, Melinda picked up two donuts and four large coffees for the office staff. She paid $ 4.06 .  What is the cost of one​ doughnut? What is the cost of one large​ coffee?
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\n" ); document.write( "Equations:
\n" ); document.write( "6d + 5c = 6.86
\n" ); document.write( "2d + 4c = 4.06
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\n" ); document.write( "Modify to solve for \"d\"::
\n" ); document.write( "24d + 20c = 4*6.86
\n" ); document.write( "10d + 20c = 5*4.06
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\n" ); document.write( "Subtract and solve for \"d\"::
\n" ); document.write( "14d = 7.14
\n" ); document.write( "d = $0.51 (price of one doughnut)
\n" ); document.write( "Solve for \"c\"::
\n" ); document.write( "2d + 4c = 4.06
\n" ); document.write( "102 + 4c = 406
\n" ); document.write( "4c = 304
\n" ); document.write( "c = 76 cents = $0.76 (price of one coffee)
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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