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 21 hours. Complete the working equation that represents the number of hours, h, Richard needs to work to reach 30 hours for the week and solve the equation.
From the first three days, Richard has already worked for 21 hours, so he needs to work for an additional h hours to reach 30 hours for the week.
The working equation is:
21 + h = 30
To solve the equation, we can isolate h by subtracting 21 from both sides:
h = 30 - 21
h = <<9=9>>9
Therefore, Richard needs to work 9 more hours to reach a total of 30 hours for the week.
Let's assume the number of hours Richard needs to work to reach 30 hours for the week is represented by "h."
Given that Richard worked 21 hours for the first three days of the week, we can write the following equation:
h + 21 = 30
To find the value of "h," we need to solve this equation.
Subtracting 21 from both sides of the equation, we get:
h = 30 - 21
Simplifying the right side of the equation, we get:
h = 9
Therefore, Richard needs to work 9 more hours to reach a total of 30 hours for the week.
To find out how many hours Richard still needs to work to reach a total of 30 hours for the week, we can use an equation.
Let's denote the unknown number of hours Richard needs to work as "h".
We know that for the first three days of the week, Richard worked 21 hours. Therefore, the equation representing the number of hours Richard needs to work to reach 30 hours for the week can be written as:
21h = 30
To solve this equation for "h", we can isolate the variable by dividing both sides of the equation by 21:
h = 30 / 21
Simplifying further:
h = 10/7
Therefore, Richard still needs to work approximately 1.43 hours to reach a total of 30 hours for the week.