N = 72 - D
10D + 5N = 4.95
Substitute 72-D for N in the second equation.
10D + 5(72-D) = 4.95
Solve for D, then put value in the first equation to find N.
Every day when Lisa returns from school, she puts her change from buying lunch into a jar on her dresser. This weekend she decided to count her savings.
She found that she had 72 coins, all nickels and dimes. The total amount was $4.95. How many coins of each type did she have?
Be sure to explain how you found your answer.
Please help explain to me
2 answers
It's 27
1 answer