Marco's homework
number of days number of hours
3 3.25
9 9.75
12 13.0
30 32.5
Maribella's homework
number of days number of hours
4 4.2
8 8.4
20 21.0
28 29.4
Based on the tables showing the hours of homework done by Marco and Maribella for different periods of time, which statement is correct?
A. Marco and Maribella spend equal time doing their homework.
B. Marco spends less time on homework per night.
C. There is not enough information to tell who spends less time doing their homework.
D. Maribella spends less time on homework per night.
To compare the time spent on homework by Marco and Maribella, we can calculate the average number of hours they spend per day by dividing the total number of hours by the number of days.
For Marco:
Average number of hours per day = (3.25 + 9.75 + 13.0 + 32.5) / (3 + 9 + 12 + 30) = 58.5 / 54 = 1.083 hours per day
For Maribella:
Average number of hours per day = (4.2 + 8.4 + 21.0 + 29.4) / (4 + 8 + 20 + 28) = 62.0 / 60 = 1.033 hours per day
Comparing the averages, we can see that Marco spends more time on homework per day than Maribella. Therefore, the correct statement is:
B. Marco spends less time on homework per night.
To determine which statement is correct, we need to compare the average time per night for both Marco and Maribella.
For Marco:
- For 3 days, he did 3.25 hours of homework.
- So, his average time per night is 3.25 hours / 3 days = 1.0833 hours per night.
- Similarly, for 9 days, he did 9.75 hours of homework. So his average time per night is 9.75 hours / 9 days = 1.0833 hours per night.
For Maribella:
- For 4 days, she did 4.2 hours of homework.
- So, her average time per night is 4.2 hours / 4 days = 1.05 hours per night.
- Similarly, for 8 days, she did 8.4 hours of homework. So her average time per night is 8.4 hours / 8 days = 1.05 hours per night.
Comparing the average time per night, we see that both Marco and Maribella spend almost the same amount of time doing their homework, which is approximately 1.0833 hours per night for Marco and 1.05 hours per night for Maribella.
Therefore, the correct statement is: A. Marco and Maribella spend equal time doing their homework.
To answer this question, we need to compare the average number of hours spent on homework per night by Marco and Maribella.
For Marco's homework:
- In 3 days, he did 3.25 hours of homework, giving an average of 3.25/3 = 1.083 hours per day.
- In 9 days, he did 9.75 hours of homework, giving an average of 9.75/9 = 1.083 hours per day.
- In 12 days, he did 13.0 hours of homework, giving an average of 13.0/12 = 1.083 hours per day.
- In 30 days, he did 32.5 hours of homework, giving an average of 32.5/30 = 1.083 hours per day.
For Maribella's homework:
- In 4 days, she did 4.2 hours of homework, giving an average of 4.2/4 = 1.05 hours per day.
- In 8 days, she did 8.4 hours of homework, giving an average of 8.4/8 = 1.05 hours per day.
- In 20 days, she did 21.0 hours of homework, giving an average of 21.0/20 = 1.05 hours per day.
- In 28 days, she did 29.4 hours of homework, giving an average of 29.4/28 = 1.05 hours per day.
Comparing the averages, we can see that both Marco and Maribella spend approximately 1.083 hours per day on homework. This means that they spend an equal amount of time doing their homework. Therefore, the correct statement is:
A. Marco and Maribella spend equal time doing their homework.