Please help me on this question

Roberto has already run 16 miles.
The total miles for the marathon is 26.2 miles.
16/26 x 100 = 61.54
61% or option D is your answer

A)26•2=52there are 2 sides with the same length116-52=64the other 2 side have to be half of 64 each64/2=32the width is 32b)make two sentences about these steps because your teacher knows how you write and explain things.