1 answer:
<span>x = amount of
20% solution needed
80 grams - x = amount of 12% solution needed</span>
<span>
20% = 0.20</span>
<span />12% = 0.12
15% = 0.15
<span>Write out the
equation:
0.20x + 0.12(80-x) = 0.15(80)</span>
<span>Distribute the
part in parenthesis:
0.20x + 9.6 - 0.12x = 12</span>
Subtract 9.6
from each side and combine like terms:
0.20x - 0.12x =
12 - 9.6
<span>
0.08x = 2.4</span>
<span>Divide both
sides by 0.08:
x = 2.4/0.08</span>
<span>
<span>
x = 30 grams of the 20% solution
80 - 30 = 50 grams of the 12%</span></span>
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