Question 1051788
{{{ .15*5 = .75 }}} 
{{{ .03*7 = .21 }}}
{{{ ( .75 + .12 ) / ( 5 + 7 ) = .87/12 }}}
{{{ .87/12 = .0725 }}}
{{{ .0725*(100) = 7.25 }}}
The mixture is 7.25% fat