The average number of pages Julie read in a certain number of days was 13. In the next five days, Julie read another 97 pages. As a result, the average number of pages she read increased to 17. How many days did Julie read in total?
| |
At first |
In the end |
| Number |
1 u |
1 u + 5 |
| Value |
13 |
17 |
| Number x value |
13 u |
17 u + 85 |
Number of days that Julie read at first = 1 u
Number of pages that Julie read at first
= 1 u x 13
= 13 u
Number of pages that Julie read in the end = 13 u + 97
Number of days that Julie read in the end = 1 u + 5
Number of pages that Julie read in the end
= 17 x (1 u + 5)
= 17 u + 85
17 u + 85 = 13 u + 97
17 u - 13 u = 97 - 85
4 u = 12
1 u = 12 ÷ 4 = 3
Number of days that Julie read in the end
= 1 u + 5
= 3 + 5
= 8
Answer(s): 8
