Question 1164169
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There are 3/4 of the bottle volume of the pure alcohol and 1/4 of the bottle volume of water in the 1-st bottle.


There are 4/5 of the bottle volume of the pure alcohol and 1/5 of the bottle volume of water in the 2-nd bottle.



So, the total volume of the pure alcohol is  {{{3/4}}} + {{{4/5}}} = {{{15/20 + 16/20}}} = {{{31/20}}} of the bottle volume.


    The total volume of water is  {{{1/4}}} + {{{1/5}}} = {{{5/20 + 4/20}}} = {{{9/20}}} of the bottle volume.



The ratio alcohol to water volumes in the mixture is thus  {{{31/9}}}.    <U>ANSWER</U>
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Solved.