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ddd [48]
3 years ago
13

Can someone help me plss!!?? ​

Mathematics
2 answers:
VashaNatasha [74]3 years ago
7 0

Answer:

1/12

Step-by-step explanation:

2(x - ¼) = 2×3[(x - ¼)/3]

= 6(⅓x - 1/12)

VMariaS [17]3 years ago
5 0
Answer: 1/12 || 2x-1/2=2x-1/12
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How much pure acid should be mixed with 6 gallons of a 20% acid solution in order to get a 90% acid solution?
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we know whatever "x" and "y" amounts are, they -> x + 6 = y

and we also know that x + 1.2 = 0.9y

\bf \begin{array}{lccclll}
&\stackrel{gallons}{acid}&\stackrel{acid~\%}{quantity}&\stackrel{acid~gallons}{quantity}\\
&------&------&------\\
\textit{pure acid}&x&1.00&x\\
\textit{20\% sol'n}&6&0.20&1.2\\
------&------&------&------\\\
mixture&y&0.90&0.9y
\end{array}
\\\\\\
\begin{cases}
x+6=\boxed{y}\\
x+1.2=0.9y\\
----------\\
x+1.2=0.9\left( \boxed{x+6} \right)
\end{cases}
\\\\\\
x+1.2=0.9x+5.4\implies x-0.9x=5.4-1.2\implies 0.1x=4.2
\\\\\\
x=\cfrac{4.2}{0.1}\implies x=\stackrel{gallons}{42}
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