Answer
158.7 mL
Work Step by Step
Volume increased by iron:
Density = mass/volume
volume = mass/Density = 15.0 g / 7.86 g/ml = 1.9 mL
Volume increased by Lead:
volume = mass/Density = 20.0 g / 11.3 g/ml = 1.77 mL
Total volume increased = 1.91 mL + 1.77 = 3.68 mL
New volume = 155 mL + 3.68 mL = 158.68 mL
