Your friend claims that she has a bag of 30 coins containing nickels, dimes, and quarters. The total value of the 30 coins is $3. There are twice as many nickels as there are dimes. Is your friend correct? Explain your reasoning

4 answers

n + d + q = 30

5 n + 10 d + 25 q = 300

n = 2 d

so
3 d + q = 30 so q = 30 - 3 d
and
20 d + 25 q = 300

20 d + 25(30-3d) = 300
20 d - 75 d + 750 = 300
55 d = 450
d = 8.18
We will have to saw that last dime up

daddy