Answer: 8 nickels
Step-by-step explanation:
To find the amount of nickels, we can use system of equations. Let's use n for nickel and d for dimes.
Equation 1
n+d=30
This equation comes from the total amount of coins.
Equation 2
0.05n+0.1d=2.6
This equation comes from the worth of the nickels and dimes added together.
To the amount of nickels, we can use elimination method.
0.1n+0.1d=3
0.05n+0.1d=2.6
Now that the dimes are equal, we can subtrace the equations.
0.05n=0.4
n=8
There are a total number of 8 nickels.
