An arithmetic sequence is of the form a, a+d, a+2d, ..., a+(n-1)d where a is the first term and d=-5 the common difference between terms, and n is the number of terms. The 16th term is a+15d and the 10th is a+9d=82. So a-45=82, a=82+45=127. The 16th term is 127-75=52.
The sequence looks like 127, 122, 117, 112, 107, 102, 97, 92, 87, 82, ...