Question 1098426
Let {{{ b }}} = the number of panels
plant B produced
{{{ .06*24000 = 1440 }}} = number of
defective panels from plant A
{{{ .02b }}} = number of defective 
panels from plant B
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{{{ { 1440 + .02b ) / ( 24000 + b ) = .05 }}}
{{{ 1440 + .02b = .05*( 24000 + b ) }}}
{{{ 1440 + .02b = 1200 + .05b }}}
{{{ .03b = 1240 }}}
{{{ b = 41333 }}}
Plant B produced 41,333 panels
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check the math and get a 2nd opinion if needed