The average number of pages Jade read in a certain number of days was 16. In the next three days, Jade read another 88 pages. As a result, the average number of pages she read increased to 21. How many days did Jade read in total?
| |
At first |
In the end |
| Number |
1 u |
1 u + 3 |
| Value |
16 |
21 |
| Number x value |
16 u |
21 u + 63 |
Number of days that Jade read at first = 1 u
Number of pages that Jade read at first
= 1 u x 16
= 16 u
Number of pages that Jade read in the end = 16 u + 88
Number of days that Jade read in the end = 1 u + 3
Number of pages that Jade read in the end
= 21 x (1 u + 3)
= 21 u + 63
21 u + 63 = 16 u + 88
21 u - 16 u = 88 - 63
5 u = 25
1 u = 25 ÷ 5 = 5
Number of days that Jade read in the end
= 1 u + 3
= 5 + 3
= 8
Answer(s): 8
