This question is solved using a system of equations, and doing this, we get that: There are 9 quarters, 4 nickels and 12 dimes.
I am going to say that:
x is the number of nickels.
y is the number of dimes.
z is the number of quarters.
In all, they are worth $3.65.
A nickel is worth $0.05, a dime is worth $0.1 and a quarter is worth $0.25, so:
![0.05x + 0.1y + 0.25z = 3.65](https://tex.z-dn.net/?f=0.05x%20%2B%200.1y%20%2B%200.25z%20%3D%203.65)
Dimes: 3 times greater than nickels:
This means that:
![y = 3x](https://tex.z-dn.net/?f=y%20%3D%203x)
Quarters: One greater than double the number of nickels:
This means that:
![z = 2x + 1](https://tex.z-dn.net/?f=z%20%3D%202x%20%2B%201)
Value of x:
We have y and z as function of x, so we can replace into the equation and find the value of x, so:
![0.05x + 0.1y + 0.25z = 3.65](https://tex.z-dn.net/?f=0.05x%20%2B%200.1y%20%2B%200.25z%20%3D%203.65)
![0.05x + 0.1(3x) + 0.25(2x+1) = 3.65](https://tex.z-dn.net/?f=0.05x%20%2B%200.1%283x%29%20%2B%200.25%282x%2B1%29%20%3D%203.65)
![0.05x + 0.3x + 0.5x + 0.25 = 3.65](https://tex.z-dn.net/?f=0.05x%20%2B%200.3x%20%2B%200.5x%20%2B%200.25%20%3D%203.65)
![0.85x = 3.4](https://tex.z-dn.net/?f=0.85x%20%3D%203.4)
![x = \frac{3.4}{0.85}](https://tex.z-dn.net/?f=x%20%3D%20%5Cfrac%7B3.4%7D%7B0.85%7D)
![x = 4](https://tex.z-dn.net/?f=x%20%3D%204)
y and z:
![y = 3x = 3(4) = 12](https://tex.z-dn.net/?f=y%20%3D%203x%20%3D%203%284%29%20%3D%2012)
![z = 2x + 1 = 2(4) + 1 = 9](https://tex.z-dn.net/?f=z%20%3D%202x%20%2B%201%20%3D%202%284%29%20%2B%201%20%3D%209)
There are 9 quarters, 4 nickels and 12 dimes.
A similar question is found at brainly.com/question/17096268