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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