davis-p
davis-p
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r + c = 17 15 r + 8 c = 192 multiply eqn 1 by 8 8 r + 8 c = 136 subtract from eqn 2 7r = 56 r = 8 c = 9
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b + r = 23: eqn 1 4b +2r = 58: eqn 2 2b + 2r = 46: 2*eqn 1 2b = 12: eqn2 - 2* eqn 1 b = 6 r = 23-6 = 17
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1) the total is 660 mL. 3% of 660 = 19.8 mL is alcohol. 97% = 660 - 19.8 = 640.2 mL of water 2) A + B = 9500 .12 A + .09 B = 1032 or 12 A + 9 B = 103200 mult. eqn 1 by 9 9 A + 9 B = 85500 subtract this from eqn 2 3 A = 103200-85500 =1…
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1) the total is 660 mL. 3% of 660 = 19.8 mL is alcohol. 97% = 660 - 19.8 = 640.2 mL of water 2) A + B = 9500 .12 A + .09 B = 1032 or 12 A + 9 B = 103200 mult. eqn 1 by 9 9 A + 9 B = 85500 subtract this from eqn 2 3 A = 103200-85500 =1…
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b + r = 23: eqn 1 4b +2r = 58: eqn 2 2b + 2r = 46: 2*eqn 1 2b = 12: eqn2 - 2* eqn 1 b = 6 r = 23-6 = 17
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r + c = 17 15 r + 8 c = 192 multiply eqn 1 by 8 8 r + 8 c = 136 subtract from eqn 2 7r = 56 r = 8 c = 9