Answer: 2 hours working on problems, 2 hours reading
Explanation:
Gilberto solved 100 questions in 1st hour from 8 to 9a.m, then solved 175-100= 75 questions in 2nd hour from 9 to 10am, then solved 225 - 175 =50 questions in 3rd hour from 10 to 11am and 250-225 = 25 questions in last hour from 11 to 12 noon.
The marginal, or additional, gain from Gilberto’s first hour of work, from 8:00 AM to 9:00 AM, is 100 questions.
The marginal gain from Gilberto’s third hour of work, from 10:00 AM to 11:00 AM is 25 questions
Gilberto showed diminishing returns over marginal and reduction in questions solved by 25 each hour.
If Gilberto solves problems for 1 hour from 8 to 9am, then he will solve 100 questions, and 3 hours reading is worth solving 3 × 62.5 =187.5 problems therefore total problems solved= 287.5
If Gilberto solves for 2 hours, then he will solve 175 problems and 2 hours of reading will give 2 × 62.5 = 125 problems, therefore total problems solved = 300
If Gilberto solves for 3 hours, that means he will solve 225 problems, and 1 hour reading will be 62.5 problems, then the total problems solved will be = 225 + 62.5 = 287.5
Therefore, the best choice is 2 hours working on problem and 2 hours reading.