Question

a city researcher wants to calculate the number of cars per hour that passed down main street during the summer festival. what information is needed to make the following calculation?
total hours of the summer festival (hr)
make conversion factor
cars passed per hour (cars/hr)
number of cars (cars)
carlos is in a band that has made some cds of their music. they have sold some of the cds and want to know how many remain. what information is needed to make the following calculation?
cds produced (cds)
subtract
cds remaining (cds)
cds sold (cds)
sam runs a company that takes visitors on day long mountain hikes. each group of hikers must have a certain number of guides leading them. he wants to know how many guides he needs for tomorrow. what information is needed to make the following calculation?
guides per group (guides/group)
use conversion factor
guides (guides)
number of groups (groups)
george works as a pilot and wants to determine his total flight time for the two flights he will pilot today. what information is needed to make the following calculation?
flight 1 time (hrs)
add
total flight time (hrs)
flight 2 time (hrs)

Explanation:

Step1: Identify calculation for cars/hr

To find cars per hour, we use $\frac{\text{Total number of cars}}{\text{Total festival hours}}$. The missing input is the total number of cars that passed.

Step2: Identify calculation for remaining CDs

To find remaining CDs, we use $\text{Total CDs produced} - \text{CDs sold}$. Both required inputs are already labeled.

Step3: Identify calculation for total guides

To find total guides, we use $\text{Number of groups} \times \text{Guides per group}$. Both required inputs are already labeled.

Step4: Identify calculation for total flight time

To find total flight time, we use $\text{Flight 1 time} + \text{Flight 2 time}$. Both required inputs are already labeled.

Answer:

1. For the cars per hour calculation: The missing required information is Number of cars (cars)
2. For the remaining CDs calculation: The required information is already provided: CDs produced (CDs) and CDs sold (CDs)
3. For the total guides calculation: The required information is already provided: Guides per group (guides/group) and Number of groups (groups)
4. For the total flight time calculation: The required information is already provided: Flight 1 time (hrs) and Flight 2 time (hrs)