When we divide the numbers 272 758 and 273 437 by a two-digit number N, we get remainders of 13 and 17 respectively. Find the sum of the
digits of N.
(A) 6
(B) 9
(C) 10
(D) 11
(E) 12
answer is attached but I don't understand it...

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.