Five medical experts, working together at the same constant rate, can write an anatomy textbook in 32 days. How many additional experts, working together at this same constant rate, are needed to write the textbook in 10 days?  Select the correct option:
A) 7 B) 9 C) 11 D) 13 E) 15
Each expert can write 1/160 of the book per day.   To complete the book in 10 days, we need 160/10= 
<gadget id="calculator">160/10</gadget>
<output>16</output>
16 experts, thus 13 more experts are needed.   The answer is 13.
<result>D</result>
Five medical experts, working together at the same constant rate, can write an anatomy textbook in 32 days. How many additional experts, working together at this same constant rate, are needed to write the textbook in 10 days?