Question

In a process, 5 Kgs of water is added to a container and after some interval 3 Kgs of water is taken out. If finally there is 7 Kgs of water then how much water was there in the very beginning?

(a) 5 Kg

(b) 10 Kg

(c) 15 Kg

(d) 20 Kg

This question was addressed to me in unit test.

I'd like to ask this question from Material Balances -V in portion Material Balances of Chemical Process Calculation

Answer 1

The correct option is (a) 5 Kg

The explanation is: Final condition = Initial condition + sum of inputs – sum of outputs.