document.write( "Question 210927: 1. How much 84 octane gas and 98 octane gas should be blended to make 14 gallons of 92 octane gas?\r
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document.write( "2. A train leaves a station and travels north at 50 km/h. Two hours later a second train leaves on a parallel track traveling north at 90 km/h. how far from the station will they meet?\r
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Algebra.Com's Answer #159366 by checkley77(12844)![]() ![]() ![]() You can put this solution on YOUR website! 98x+84(14-x)=92*14 \n" ); document.write( "98x+1176-84x=1288 \n" ); document.write( "14x=1288-1176 \n" ); document.write( "14x=112 \n" ); document.write( "x=112/14 \n" ); document.write( "x=8 gallons of 98 octane gas is used. \n" ); document.write( "14-8=6 gallons of 84 octane gas is used. \n" ); document.write( "98*8+84*6=92*14 \n" ); document.write( "784+504=1288 \n" ); document.write( "1288=1288 \n" ); document.write( "------------------------------------------------- \n" ); document.write( "50t=90(t-2) \n" ); document.write( "50t=90t-180 \n" ); document.write( "50t-90t=-180 \n" ); document.write( "-40t=-180 \n" ); document.write( "t=-180/-40 \n" ); document.write( "t=4.5 hours after the first train leaves the station they will meet. \n" ); document.write( "50*4.5=225 miles is the distance traveled. \n" ); document.write( "90(4.5-2)=90*2.5=225 miles. \n" ); document.write( " |