Martin sorted the bolts in his toolbox by size. they measured 3/8inch, 1/2inch, 5/8 inch, 7/8 inch ,and 1/4 inch. what is the difference in length between the longest bolt and shortest bolt?

The longest bolt from Martin's toolbox is 7/8 inch and the shortest bolt is 1/4 inch.
Taking the difference between these two
Difference = 7/8 inch-1/4 inch
                   = (7-4)/8 inch
                   =3/8 inch
The difference between the longest bolt from the shortest bolt in Martin's toolbox is 3/8 inch

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b. 2/3