Alittle aluminum boat (mass of 14.50 g. has a volume of 450.00 cm3. the boat is placed in a small pool of water and carefully filled with pennies. if each penny has a mass of 2.50 g, how many pennies can be added to the boat before it sinks?

When the volume is 450 cm3 so the boat will displace 450 g.

so we have  450 g - 14.5g = 435.5 left 

so to get how many pennies can be added to the boat before it sinks can be determined by:

divided the mass for the one penny:

no.of Penny = 435.5 / 2.5g

                     = 174.2 

∴ the boat will float with 174 pennies and will start to sink with 175