A 20% acid solution is mixed with a 70% acid solution to get 50 liters of a 40% solution. Which of the following expressions is equal to 4(50)
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do you mean 40%(50) ?? or 0.4(50) ??
if so,...
20%(x)+70%(50-x)=40%(50)
0.2x+0.7(50-x)=0.4(50)
solving...
0.2x+35-0.7x=20
-0.5x+35=20
-0.5x=20-35
-0.5x=-15
0.5x=15
5x=150
x=150/5
x=30 liters of the 20% solution
50-30=20 liters of the 70% solution
if so,...
20%(x)+70%(50-x)=40%(50)
0.2x+0.7(50-x)=0.4(50)
solving...
0.2x+35-0.7x=20
-0.5x+35=20
-0.5x=20-35
-0.5x=-15
0.5x=15
5x=150
x=150/5
x=30 liters of the 20% solution
50-30=20 liters of the 70% solution
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