Question

5. Walker is reading a book that is 792 pages. He reads
15 pages a day during the week, and 25 pages a day
during the weekend. After 5 weeks of reading, how
many pages does Walker still have left to read before
he finishes the book?
Let r represent the pages left to read.
Equation:
Walker has
to read.
pages left

Answer 1

Forming Equations from Word Problems

To form equations from word problems, we can derive mathematical operations as well as variables from the given information.

In this case, each time Walker reads a certain number of pages, we subtract that from the total number of pages left to know how many pages is left to read.

Solving the Question

Let r represent the pages left to read.

792 pages in total

• ⇒ r = 792

Walker reads 15 pages a day during the week and 25 pages a day during the weekend.

• There are 5 weekdays, and he reads 15 pages each of those days. ⇒ r = 792 - 5×15

• There are 2 weekend days, and he reads 25 pages each of those days.
  ⇒ r = 792 - (5×15 + 2×25)

5 weeks have passed

• Multiply the terms representing the number of pages he reads a week by 5, for 5 weeks.
  ⇒ r = 792 - (5×15 + 2×25)×5

Answer

r = 792 - (5×15 + 2×25)×5