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h = 30 - 21 1/5
To simplify this equation, we need to convert 21 1/5 to an improper fraction.
21 1/5 is equivalent to (21*5 + 1)/5 = 106/5
h = 30 - 106/5
To subtract fractions, we need to have a common denominator.
30 can be written as 30/1.
h = 30/1 - 106/5
We can convert 30/1 to 150/5 to have a common denominator.
h = 150/5 - 106/5
Now we can subtract the numerators.
h = (150 - 106)/5
h = 44/5
Therefore, Richard needs to work 44/5 hours to reach 30 hours for the week.