Answer:
230 million
Step-by-step explanation:
The labour force of a country is made up of those that are employed and those that are willing to work (that is looking for employment).
It indicates the total number of people that's willing and able to work in an economy.
In the given scenario total population is 500 million. The people under 16 or institutionalised are not considered part of labour force as legal working age is 18 years.
The number of people not in labour for is 150 million. This is also deducted from total population.
Labour force = 500 - 150 - 120 = 230 million