A nurse mixes 60 cc of a 50% saline solution with a 10% saline solution to produce a 15% saline solution. How much of the 10% solution should he use?

Question

A nurse mixes 60 cc of a 50% saline solution with a 10% saline solution to produce a 15% saline solution. How much of the 10% solution should he use?

Answer 1

60*0.5 + X*0.1 = (60+X)*0.15

solve for X.

since 10% is closer to 15% than 60% is to 15%, it makes sense that more than 60cc of the 10% is used.

indeed, the answer verifies this.