Sarita is reading a book of 500 pages. She reads 20 pages every day. How many pages class 9
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Sarita is reading a book of 500 pages. She reads 20 pages every day. How many pages class 9
Question 1.
Sarita is reading a book of 500 pages. She reads 20 pages every day. How many pages will be left after 15 days? Express this as a linear pattern Class 9
Solution:
Total number of pages = 500
Number of pages read every day = 20
| Day (n) | Remaining pages after reading |
| 0 | 500 |
| 1 | 500 - 20 × 1 = 480 |
| 2 | 500 - 20 × 2 = 460 |
| 3 | 500 - 20 × 3 = 440 |
| ... | ... |
| n | 500 - 20n |
The linear pattern representing the remaining pages after n days is 500 - 20n
Substituting n = 15 in 500 - 20n, we get
500 - 20(15) = 500 - 300 = 200
∴ 200 pages will be left after 15 days.