multiple choice

please answer

In a closed system made of two tanks, with equal volumes, initially the first tank contains fresh water and the second tank contains brine with 100 kg of salt after long time of mixing each tank will contain: Select one: a. 100 kg salt b. 75 kg salt C. 50 kg salt In the mixing of the contents of two tanks with different initial concentration and same volume, the final concentration in both tank is: Select one a proportional to the size of each tank b. same as the initial concentration c. equal