Answer :
The total number of pages = 288
Already read 90
Remaining 288-90 = 198 pages
At the rate of 20 pages a day, she needs 198/20 days =9.9 days.≈ 10days
Already read 90
Remaining 288-90 = 198 pages
At the rate of 20 pages a day, she needs 198/20 days =9.9 days.≈ 10days