Enrico spent 0.4 hour completing his math homework. Then he spent 7 over 20 hour completing his science homework. What is the total number of hours Enrico spent on his math and science homework?
0.4 + 7/20 = 0.4 + 0.35 = 0.75
or
2/5 + 7/20 = 8/20 + 7/20 = 15/20 = 3/4
To find the total number of hours Enrico spent on his math and science homework, we need to add the time spent on the two subjects.
Enrico spent 0.4 hour on math homework and 7 over 20 hour on science homework.
To add these times together, we need to find a common denominator. The product of the denominators, 1 and 20, gives us the common denominator of 20.
0.4 can also be written as 0.4 * 20/20 = 8/20.
Now we can add the two fractions: 8/20 + 7/20 = (8 + 7) / 20 = 15 / 20.
Therefore, Enrico spent a total of 15 over 20 hour on his math and science homework.
To find the total number of hours Enrico spent on his math and science homework, we add the time spent on each subject.
Time spent on math homework = 0.4 hour
Time spent on science homework = 7/20 hour
To add these fractions, we need to find a common denominator. The common denominator of 4 and 20 is 20.
Converting 0.4 to twentieths: (0.4 * 20) = 8 twentieths
The time spent on math homework in twentieths = 8/20
So, the total time spent on math and science homework in twentieths = 8/20 + 7/20 = (8 + 7) / 20 = 15/20
To simplify this fraction, we divide the numerator and denominator by their greatest common divisor, which is 5.
The simplified fraction is 15/20 = (15 ÷ 5) / (20 ÷ 5) = 3/4
Therefore, Enrico spent a total of 3/4 hour on his math and science homework.