Answer:
The answer is 0.15 g/mL
Step-by-step explanation:
The density of a substance can be found by using the formula

From the question
mass = 15 g
volume = final volume of water - initial volume of water
volume = 400 - 300 = 100 mL
We have

We have the final answer as
0.15 g/mL
Hope this helps you