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7L of an acid solution was mixed with 3L of a 15% acid solution to make a 29% acid solution. Find the percent concentration of the first solution.

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7L of an acid solution was mixed with 3L of a 15% acid solution to make a 29% acid solution. Find the percent concentration of the first solution.
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Let 7L acid solution concentration=x%
According to question
`(7x+3*15)/10=29`
`7x+45=290`
`x=35%`.
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