from a container having pure milk , 10 % is replaced by water and the process is repeated twice . at the end of the second operation , the milk is ?
"let the total quantity of original milk = 1000 gm milk after 1 st operation = 90 % of 1000 = 900 gm milk after second operation = 90 % of 900 = 810 gm strength of final mixture = 81 % answer is e"
multiply(power(divide(subtract(const_100, 10), const_100), const_3), const_100)