Every bedtime, Juwella reads a book. Three nights ago, she read 15 pages. Two nights ago she read twice that many pages, while last night she read 5 pages more than the previous night. She promised to read the remaining pages of the book tonight. If the book has 100 pages, how many pages will she read tonight?
Thoughts? Step-by-step reasoning:
Juwella read 15 x 2 = 30 pages two nights ago. She read 30 + 5 = 35 pages last night. She read a total of 15 + 30 + 35 = 80 pages for three nights. Thus, she needs to read 100 - 80 = 20 pages tonight to finish the book.
Thus, the answer is 20.