The average number of pages Jaslyn read in a certain number of days was 15. In the next four days, Jaslyn read another 98 pages. As a result, the average number of pages she read increased to 17. How many days did Jaslyn read in total?
| |
At first |
In the end |
| Number |
1 u |
1 u + 4 |
| Value |
15 |
17 |
| Number x value |
15 u |
17 u + 68 |
Number of days that Jaslyn read at first = 1 u
Number of pages that Jaslyn read at first
= 1 u x 15
= 15 u
Number of pages that Jaslyn read in the end = 15 u + 98
Number of days that Jaslyn read in the end = 1 u + 4
Number of pages that Jaslyn read in the end
= 17 x (1 u + 4)
= 17 u + 68
17 u + 68 = 15 u + 98
17 u - 15 u = 98 - 68
2 u = 30
1 u = 30 ÷ 2 = 15
Number of days that Jaslyn read in the end
= 1 u + 4
= 15 + 4
= 19
Answer(s): 19
