Solution:
The given situation about Bridget is :
Bridget reads 5 pages of her book per day 4 days per week.
Describing the situation in unitary method:
Number of pages read by Bridget in a week(4 Days) = 5 × 4 = 20 pages
In w Weeks , number of days = 7 w
She reads 5 pages for 4 days in a week.
In w Weeks , number of days Bridget read = 7 w -3 w= 4 w days, where w=1,2,3,4,5......
Number of pages read by Bridget in w week= Number of pages read in a week × Number of days in w week in which Bridget read 5 pages
= 5 ×(4 w)
= 20 w which is equivalent to
= 5 × (w+w+w+w)→→→Option (D)