Question

the average temperature of planet earth has increased. about two - thirds of the increase observed in the twentieth century has happened since 1975.\ based on this statement, which of the following assertions about temperature increase noted in the twentieth century is true?
) two - thirds of it occurred between 1900 and 1975.
) one - third of it occurred between 1975 and 1999.
) two - thirds of it occurred between 1950 and 1999.
) one - third of it occurred between 1900 and 1975.

Explanation:

The statement says that about two - thirds of the temperature increase in the twentieth century happened since 1975. So, the remaining one - third must have occurred before 1975 (i.e., between 1900 and 1975).

Answer:

D. One - third of it occurred between 1900 and 1975.