Answer:
60 ; 20
B.) 1 hour working on problems, 3 hours reading
Step-by-step explanation:
Given the information :
Time - - - Total problems Answered
8am: - - - - 0
9am: - - - - 80
10am: - - - - 140
11am: - - - - -180
noon: - - - - 200
The marginal, or additional, gain from Ana’s second hour of work, from 9:00 AM to 10:00 AM, is ?
(Total problem answered at 10 a.m - Total problems Answered at 9a.m)
(140 - 80) = 60
The marginal gain from Ana’s fourth hour of work, from 11:00 AM to noon, is ?
(Total problem answered at Noon - Total problems Answered at 11a.m)
(200 - 180) = 20
In other to get the best possible exam score,
Since it is assumed that
Solving 70 problems is equivalent to 1 hour of reading in terms of score improvement
Also, it is assumed that the same number of pages is covered for every hour spent whine reading.
Hence it is only during the first hour, that is (8:00 - 9:00) that she was able to solve above 70 questions (80 - 0). Number of questions solved during subsequent hours were not up to 70, hence it would have been more rewarding if they had been used for reading.
Hence, she should have spent 1 hour working on problems and 3 hours reading
