In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[EX Q]: Notebooks are laptop computers that weigh between five and _ pounds.
[EX A]: seven

[EX Q]: Optical isomers differ in the arrangement of _ groups around a chiral carbon.
[EX A]: four

[EX Q]: T is the temperature difference between the _ locations.
[EX A]:
two