X% of 40 =28 percents

Subtract 8 1/6 - 4 5/6 . simplify the answer and write as a mixed number.

According to modern science, earth is about 4.5 billion years old and written human history extends back about 10,000 years. suppose the entire history of earth is represented with a 10-meter-long timeline, with the birth of earth on one end and today at the other end.

Which of the following is the result of expanding the series