Question

Captain Jack Sparrow started selling when he was 16 at the age of 19 he covered of 1.8 of the Pacific Ocean at 21 he completed 3.8 of a remaining part of find out what part of the sea still remaining into the Explorer

Answer 1

Assuming the given numbers are percentages,
At age 19, remaining part of the ocean = 98.2%
At 21, remaining part = 98.2 - 0.038×98.2 ~=94.47%