"In a jar there is mixture of milk and water in the ratio of 7:5. 9 liters of mixture was taken out and replaced by same quantity of water and after that the ratio becomes 7:9 in the jar. find out original quantity of mixture or find out quantity of milk in jar?"
After solving this by allegation i got ratio of mixture and water 3:1. if 1 is equal to 9 then 3 must be equal to 27 and 3 was total mixture so total mixture was 27 liters according to me. but the answer is total mixture was 36(27+9).
I can't understand why?