Answer :
If there is 5/8 of a total fuel supply on board, the ship can make 6 round trips
Solution:
Let the number of the round trips the ships make be "n"
Now, according to question in one trip the ship consumes [tex]\frac{1}{6}[/tex] of its total fuel supply which is given to be [tex]\frac{5}{8}[/tex]
Fuel supply used in "1" trip = [tex]\frac{1}{6} \times \frac{5}{8}[/tex]
Now fuel supply used for "n" trip is given as:
[tex]n \times \frac{1}{6} \times \frac{5}{8}=\frac{5}{8}[/tex]
[tex]n = 6[/tex]
Hence the ship can make 6 round trips