Question 1176272
70%, the low concentration 
95%, the high concentration
85%, the mix concentration
60 gallons , how much of the mix result



v, amount of the high concentration antifreeze


{{{70(60-v)+95v=85*60}}}

-

{{{70*60-70v+95v=85*60}}}

{{{95v-70v=85*60-70*60}}}

{{{(95-70)v=60(85-70)}}}

{{{highlight_green(v=60((85-70)/(95-70)))}}}--------and you can finish from here.