The average number of pages Yoko read in a certain number of days was 17. In the next eight days, Yoko read another 49 pages. As a result, the average number of pages she read decreased to 14. How many days did Yoko read in total?
| |
At first |
In the end |
| Number |
1 u |
1 u + 8 |
| Value |
17 |
14 |
| Number x value |
17 u |
14 u + 112 |
Number of days that Yoko read at first = 1 u
Number of pages that Yoko read at first
= 1 u x 17
= 17 u
Number of pages that Yoko read in the end = 17 u + 49
Number of days that Yoko read in the end = 1 u + 8
Number of pages that Yoko read in the end
= 14 x (1 u + 8)
= 14 u + 112
17 u + 49 = 14 u + 112
17 u - 14 u = 112 - 49
3 u = 63
1 u = 63 ÷ 3 = 21
Number of days that Yoko read in the end
= 1 u + 8
= 21 + 8
= 29
Answer(s): 29
