Question 793496
Let {{{ x }}} = the percent concentration in the mixture
{{{ .1*200 = 20 }}} ounces of pure orange juice in 10% mixture
--------------------
{{{ ( 50 + 20 ) / ( 50 + 200 ) = x }}}
{{{ 70 / 250 = x }}}
{{{ x = 7/25 }}}
{{{ x = .28 }}}
{{{ .28*100 = 28 }}}
The percent concentration of 
orange juice in the mixture is 28%