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Unformatted text preview: Jonny's original investment? x : represent amount of invested 2% => 0.02 write expression for 19% => 0.19 0.02x + 0.19 ( x + 2000) = 5000 0.02x + 0.19x + 380 = 5000 0.21x = 5000  380 0.21x = 4620 (( Divide by 0.21 )) x = 22000 x + ( x +2000) = 2x + 2000 2x + 2000 => 2 (22000) +2000 => 46000 ==================================================================== How many gallon of a 80% antifreeze solution must be mixed with 90 gallons of 20% antifreeze to get a mixture that is 70% antifreeze? Use the Sixstep method. x = gallon of 50% antifreeze 0.80x 90 gallon of 20% is 0.20 (90) 0.80x + 0.20 ( 90 ) 0.70 ( x + 90 ) Rate Gallon of mixture Pure Antifreeze 0.80 X 0.80x 0.20 90 0.20 (90) 0.70 X+100 0.70 (x +90) 100 {0.80x + 0.20 (90)}= 100 {0.70 (x+90)} 80x + 20 (90) = 70 (x+90) 80x + 20 (90) = 70x + 6300 80x 70x = 6300  1800 10x = 4500 x = 450...
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This note was uploaded on 04/24/2010 for the course MATH 115 taught by Professor Austin during the Spring '10 term at USC.
 Spring '10
 Austin
 Math

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