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