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This is a conversion factor problem.
1. list the information
1 pound = 454 grams
1 penny = 2.4 grams
2. Set up the question we need to answer.
? pennies/ pound =
We need to have the label penny in the top of the fraction
(1 penny/ 2.4 grams )
We need to cancel out the label "grams" and have pounds in the bottom of the fraction.
so we use (454 grams/ 1 pound)
3. The string of terms looks like this
? pennies / pound = (1 penny/ 2.4 grams ) ( (454 grams/ 1 pound)
The label grams cancels because it is the top and bottom of the fraction.
? pennies / pound = (1 penny/ 2.4 grams ) ( (454 grams/ 1 pound) = 454 pennies / 2.4 pounds = 189 pennies/ pound
The answer is ? pennies / pound = 454 pennies / 2.4 pounds = 189 pennies/ pound