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Marie has 39 quarters and nickels. The total value is $ 5.15.
Write an equation and solve for how many quarters and nickels she has.
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Let Q be the number of quarters.
Then the number of nickels is (39-Q).
Write the total money equation, in cents
25Q + 5*(39-Q) = 515 cents.
Simplify and find Q
25Q + 5*39 - 5Q = 515
25Q - 5Q = 515 - 5*39
20Q = 320
Q = 320/20 = 16.
ANSWER. 16 quarters and 39-16 = 23 nickels.
CHECK. 25*16 + 5*23 = 515 cents, in total. ! correct !
Solved.
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For introductory coin problems, look into the lessons
- Coin problems
- More Coin problems
- Solving coin problems without using equations
- Kevin and Randy Muise have a jar containing coins
in this site.
Read them attentively and become an expert in this field.
