Noelle has 198 coins, all nickels and dimes. noelle has 20 more nickels than dimes. how many of each coin does noelle have?

109 nickels and 89 dimes

Steps:
198 coins in total and the amount of nickels are 20 more than dimes. (n for the amount of nickels, d for the amount of dimes):

n = 20 + d
n + d = 198

Take the first equation and make it into:
n - d = 20

Now let’s add both equations together:
n + d + n - d = 218
2n = 218
n = 109

109 - 20 = d
d = 89

That. you would have multiple