instruction:
In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.
question:
Optical isomers differ in the arrangement of _ groups around a chiral carbon.
answer:
four


question:
Most people tan two to _ times a week.
answer:
three


question:
Males typically live for _ years in the wild, and females for up to seventeen years.
answer:

ten