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Salinity of sea water is usually measured in parts per:

hundred
thousand
%
million

35 parts per thousand.

Explanation: How much salt in a sea is measured in parts. So, meaning by that, it is measured by 35 parts per thousand. It's use as the grams of salt in the water, which is 1,000 grams of salt in water. 35 grams of salty water is equal to 1 kilogram of seawater.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3