Question 1091628
5:2 is total of 7 parts.
{{{42/7=6}}}


{{{(5/7)*42=30}}}------liters milk
and
{{{(2/7)*42=12}}}-----liters water



Add v liters of water to get 2:1 milk to water.
{{{30/(v+12)=2/1}}}


{{{30=2(v+12)}}}

{{{15=v+12}}}

{{{highlight(v=3)}}}-------------Add three liters of water.