The average number of pages Lynn read in a certain number of days was 16. In the next six days, Lynn read another 11 pages. As a result, the average number of pages she read decreased to 11. How many days did Lynn read in total?
| |
At first |
In the end |
| Number |
1 u |
1 u + 6 |
| Value |
16 |
11 |
| Number x value |
16 u |
11 u + 66 |
Number of days that Lynn read at first = 1 u
Number of pages that Lynn read at first
= 1 u x 16
= 16 u
Number of pages that Lynn read in the end = 16 u + 11
Number of days that Lynn read in the end = 1 u + 6
Number of pages that Lynn read in the end
= 11 x (1 u + 6)
= 11 u + 66
16 u + 11 = 11 u + 66
16 u - 11 u = 66 - 11
5 u = 55
1 u = 55 ÷ 5 = 11
Number of days that Lynn read in the end
= 1 u + 6
= 11 + 6
= 17
Answer(s): 17
