After 5L water taken out, remaining water =50−5=45L ∵ Water is replaced with wine. ∴ Quantity of wine =5L Now, in next step same process is done and 10% of water and 10% of wine take out from mixture. ∴ In mixture, remaining water =45−4.5=40.5L and remaining wine =5−0.5=4.5L Now, 5L of wine is added. So, total quantity of wine in final mixture =4.5+5=9.5L and remaining water in final mixture =40.5L ∴ Required ratio =9.5:40.5 =95:405=19:81