Century and Region of United States Presidents' Births as of 2014

The table above shows the distribution of United States presidents according to the century and the region of the country in which they were born. Based on the information in the table, what fraction of presidents who were not born in the nineteenth century were born in the South?

The correct answer is: 0.5

HINT: Consider only 18^th and 20^th century columns and then find the fraction.
Complete step by step solution:
Presidents not born in the 19^th century means we consider only the 18^th and 20^th centuries.
In 18^th century, total presidents born = 14
In 20^th century, total presidents born = 10
So total presidents not born in 19^th century = 14 + 10 = 24
Among them, presidents who were born in South in 18^th century = 9
presidents who were born in South in 20^th century = 3
So total presidents born in the South = 12
Hence fraction of presidents who were not born in 19^th century were born in the South =