Stephanie adds pennies, nickels and quarters to a scale until the mass of the combined coins is $75$75​ grams. Each penny has a mass of $2.5

Question

Stephanie adds pennies, nickels and quarters to a scale until the mass of the combined coins is $75$75​ grams. Each penny has a mass of $2.5$2.5​ grams, each nickel has a mass of $5$5​ grams and each quarter has a mass of $5.7$5.7​ grams.

Create an equation to model this situation, where $x$x​ is the number of pennies, $y$y​ is the number of nickels and $z$z​ is the number of quarters that Stephanie can put on the scale so that the mass of the combined coins is exactly $75$75​ grams.

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Thu Thủy 1 year 2021-09-04T10:31:32+00:00 1 Answers 65 views 0

Answers ( )

  1. thanhcong
    0
    2021-09-04T10:33:15+00:00
    Reply

    2.5x + 5y + 5.7z = 75

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