Question

for the following questions, the right hand box shows what you are trying to calculate. use the 3 pull - down menus to

• choose the inputs that when combined will give you the correct calculation
• choose the action needed to combine the inputs

note: which input is on the top or bottom does not matter.
tip: hold down one of the input pull - down menus to review your choices. for each question, the two input pull - downs
have the same choices.
if you dont know what make a conversion factor and use a conversion factor mean in the pull - down menus, click the
check answers button and read the lesson.
question 1: pat is calculating her total gas usage. choose the correct inputs and action.
gas per mile driven (gal/mi)
total gas usage (gal)
number of miles (mi)
question 2: darcy is figur pound. choose the correct inputs and action.
ball bearings per pound (bearings/lb)
question 3: the city planner wants to know how much water pipe is used per street in her city. choose the correct
inputs and action.
water pipe per street (ft/st)

Explanation:

Step1: Identify units for total gas

We need total gas in gallons. Given $\text{gal/mi}$ and $\text{mi}$, multiply to cancel miles.

Step2: Select action for Question1

Multiply the two inputs: $\text{gas per mile} \times \text{miles driven} = \frac{\text{gal}}{\text{mi}} \times \text{mi} = \text{gal}$
Action: use conversion factor

Step3: Identify inputs for Question2

To find $\text{bearings/lb}$, use total bearings and total pounds.
Action: make conversion factor (divide bearings by pounds)

Step4: Identify inputs for Question3

To find $\text{ft/st}$, use total pipe length (ft) and total streets (st).
Action: make conversion factor (divide pipe length by streets)

Answer:

Question 1:
Inputs: gas per mile driven (gal/mi), number of miles (mi)
Action: use conversion factor

Question 2:
Inputs: total number of ball bearings, total weight in pounds
Action: make conversion factor

Question 3:
Inputs: total length of water pipe (ft), total number of streets (st)
Action: make conversion factor