The average number of pages Ivory read in a certain number of days was 14. In the next four days, Ivory read another 32 pages. As a result, the average number of pages she read decreased to 10. How many days did Ivory read in total?
| |
At first |
In the end |
| Number |
1 u |
1 u + 4 |
| Value |
14 |
10 |
| Number x value |
14 u |
10 u + 40 |
Number of days that Ivory read at first = 1 u
Number of pages that Ivory read at first
= 1 u x 14
= 14 u
Number of pages that Ivory read in the end = 14 u + 32
Number of days that Ivory read in the end = 1 u + 4
Number of pages that Ivory read in the end
= 10 x (1 u + 4)
= 10 u + 40
14 u + 32 = 10 u + 40
14 u - 10 u = 40 - 32
4 u = 8
1 u = 8 ÷ 4 = 2
Number of days that Ivory read in the end
= 1 u + 4
= 2 + 4
= 6
Answer(s): 6
