Calculate the percentage composition in terms of mass of solution obtained by mixing 300 g of a 25 % and 400 g of a 40 % solution by mass.

Explanation

To calculate the percentage composition in terms of mass of the solution obtained by mixing 300 g of a 25% solution and 400 g of a 40% solution, we will follow these steps:

### Step-by-Step Solution:

1. **Calculate the mass of solute in the first solution:**
- The first solution is 300 g with a concentration of 25%.
- Mass of solute = (25/100) × 300 g = 75 g.

...