Ahoy there, matey! Our pirate ship had 5/6 of a treasure chest full of gold.

Answer:
1 [tex]\frac{5}{24}[/tex] teasure chests of gold
Step-by-step explanation:
Since this is a problem of adding or subtracting fractions, you will have to do one or the other to solve. Since the pirates already had [tex]\frac{5}{6}[/tex] of a treasure chest of gold and stole another [tex]\frac{3}{8}[/tex] of a treasure chest to add to their collection, we need to add these two fractions:
[tex]\frac{5}{6}+\frac{3}{8}[/tex]
In order to add or subtract fractions, you need to have a common denominator. Choosing a common denominator means looking for the lowest common multiple of the two denominators:
6: 6, 12, 18, 24
8: 8, 16, 24
[tex]\frac{5}{6}=\frac{20}{24}and\frac{3}{8}=\frac{9}{24}[/tex]
Add them together: [tex]\frac{20}{24}+\frac{9}{24}=\frac{29}{24}=1\frac{5}{24}[/tex]