Farfalla kites owns 3 factories around the globe, in one year, the original factory can make 600 kites, and each of the other factories can make 900 kites. How many kites does farfalla produce every year?

Since there are three factories, you have to take the number of kites each factory makes, and add them all up.
For example: 600 + 900 + 900 = 2400
So 2400 kites.