 
 <translate> 3 / 5th of 20 liters of water is 20 * (3 / 5) = 12 liters. 5 / 6th of 18 liters of vinegar is 18 * (5 / 6) = 15 liters. 12 liters of water mixed with 15 liters of vinegar gives 12 + 15 = 27 - liter mixture.
Therefore, the answer is 27. <ibo> 3 / 5th nke 20 lita mmiri bụ 20 * (3 / 5) = 12 lita. 5 / 6 nke lita mmanya 18 bụ 18 * (5 / 6) = 15 lita. A na-agwakọta lita mmiri iri na abụọ na lita mmanya iri na ise, a na-enweta lita iri na abụọ na iri na ise na iri na ise, ya bụ, iri na abụọ na ise na iri na ise, ya bụ, iri abụọ na asaa. N'ihi ya, azịza ya bụ iri abụọ na asaa. 