Question

Kim is reading a book with 380 pages. She read 20 pages each day until she reached Part 2 of the book. Part 2 of the book is 160 pages long. She uses the equation 380−20𝑑=160 to represent the number of days, d, it took her to read Part 1. How many days did it take Kim to read Part 1 of the book?

Thanks for anyone who answers :)

Answer 1

380−20𝑑=160

Subtract 380 from both sides, multiply by -1, then divide by 20.

Answer 2

11 days