Question 1070360
{{{ .2*10 = 2 }}} pints of acid already 
in the container
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{{{ ( 2 + 3 ) / ( 10 + 3 ) = 5/13 }}} is the
fraction of the mixture that is acid
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{{{ ( 5/13 )*100 = 38.46 }}}
38.46% of the resulting mixture is acid