Final answer:
To calculate the total number of pages Sue has read this week, add up the number of pages she read each day. On Monday, she read 40 pages. On Tuesday, she read 36 pages. On Wednesday, she read 42 pages. Therefore, the total number of pages Sue has read this week is 118 pages.
Step-by-step explanation:
To calculate the total number of pages Sue has read this week, we need to add up the number of pages she read each day. On Monday, she read for 2 hours and averaged 20 pages per hour, so she read a total of 2 * 20 = 40 pages. On Tuesday, she read for 2 hours and averaged 18 pages per hour, so she read a total of 2 * 18 = 36 pages. On Wednesday, she read for 2 hours and averaged 21 pages per hour, so she read a total of 2 * 21 = 42 pages. Therefore, the total number of pages Sue has read this week is 40 + 36 + 42 = 118 pages.