During weekdays, Richard is working as a part-time library assistant at a university. He needs to work for a total of 30 hours a week. For the first three days of the week, he worked 2115

Question

21
1
5
hours. Complete the working equation that represents the number of hours, h
ℎ
, Richard needs to work to reach 30 hours for the week and solve the equation.(1 point)
h + 2115 =
ℎ

+

21
1
5

=


h =
ℎ

=
hours

Answer 1

To determine how many hours Richard needs to work for the week, we can set up the equation based on the information provided.

We know that Richard needs to work a total of 30 hours in a week. He has already worked \( 21.5 \) hours in the first three days.

Let \( h \) be the number of hours Richard needs to work for the remainder of the week. The equation representing the total hours worked will be:

\[ h + 21.5 = 30 \]

Now, we can solve for \( h \):

1. Subtract \( 21.5 \) from both sides:

\[ h = 30 - 21.5 \]

2. Calculate the right side:

\[ h = 30 - 21.5 = 8.5 \]

So, Richard needs to work \( \mathbf{8.5} \) hours to reach his total of 30 hours for the week.

Final Answer: \[ h = 8.5 \text{ hours} \]