The average number of pages Usha read in a certain number of days was 19. In the next seven days, Usha read another 37 pages. As a result, the average number of pages she read decreased to 17. How many days did Usha read in total?
| |
At first |
In the end |
| Number |
1 u |
1 u + 7 |
| Value |
19 |
17 |
| Number x value |
19 u |
17 u + 119 |
Number of days that Usha read at first = 1 u
Number of pages that Usha read at first
= 1 u x 19
= 19 u
Number of pages that Usha read in the end = 19 u + 37
Number of days that Usha read in the end = 1 u + 7
Number of pages that Usha read in the end
= 17 x (1 u + 7)
= 17 u + 119
19 u + 37 = 17 u + 119
19 u - 17 u = 119 - 37
2 u = 82
1 u = 82 ÷ 2 = 41
Number of days that Usha read in the end
= 1 u + 7
= 41 + 7
= 48
Answer(s): 48
