Stephanie adds pennies, nickels, and quarters to a scale until the mass of the combined coins is 75 grams. Each penny has a mass of 2.5 grams, each nickel has a mass of 5 grams, and each quarter has a mass of 5.7 grams. Create an equation to model this situation, where x, is the number of pennies, y is the number of nickels, and z is the number of quarters that Stephanie can put on the scale so that the mass of the combined coins is exactly 75 grams.
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Step-by-step explanation:
Let x, y and z be number of pennies, nickels and quarters respectively.
2.5x + 5y + 5.7z = 75
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