The pool of a phosphorus compartment is 645 units.Two fluxes enter the pool: one is 13 units per day;the other is 34 units per day.Two fluxes leave: one is 22 units per day;the other rate is unknown.If the pool of phosphorus is balanced,the size of the second outgoing flux is _______ units per day.
A) 12
B) 25
C) 47
D) 72
E) 645

Question

Quizplus · Accepted Answer

The total influx into the pool is 13 + 34 = 47 units per day. 
To maintain balance in the pool, the total outflow must also be 47 units per day. 
We know that one outflow is 22 units per day, so the second outflow must be 47 - 22 = 25 units per day. 
Therefore, the answer is B) 25.

The Pool of a Phosphorus Compartment Is 645 Units