Question

8 litres are drawn from a cask filled with wine and is then filled with water .This operation is performed three more times.The ratio of the quantity of wine now left in the cask to that of the total solution is 16:81.How much wine does the cask originally

Answer 1

$(4) ^{2} \div (9) ^{2} = 8 \\ 8 \times 9 \div4 \\ 18ltrs$