The average number of pages Yoko read in a certain number of days was 13. In the next six days, Yoko read another 38 pages. As a result, the average number of pages she read decreased to 8. How many days did Yoko read in total?
| |
At first |
In the end |
| Number |
1 u |
1 u + 6 |
| Value |
13 |
8 |
| Number x value |
13 u |
8 u + 48 |
Number of days that Yoko read at first = 1 u
Number of pages that Yoko read at first
= 1 u x 13
= 13 u
Number of pages that Yoko read in the end = 13 u + 38
Number of days that Yoko read in the end = 1 u + 6
Number of pages that Yoko read in the end
= 8 x (1 u + 6)
= 8 u + 48
13 u + 38 = 8 u + 48
13 u - 8 u = 48 - 38
5 u = 10
1 u = 10 ÷ 5 = 2
Number of days that Yoko read in the end
= 1 u + 6
= 2 + 6
= 8
Answer(s): 8
