Math problems of the week: varation in traditional vs. reform algebra

First variations problem sets: 


I. From Wentworth's New School Algebra, published in 1898, pp. 320-321 [click to enlarge]:

II. From Integrated Math 2, published in 2002, pp. 79-80 [click to enlarge]:

III. Extra Credit:
Comparing the two problem sets, does time expenditure vary directly or inversely with mathematical egagement?