Answer:
66 coins are not nickels, 77-66=n or n+66=77
Step-by-step explanation:
13+28+25 is 66. The rest (11 coins) are nickels. 66+11=77, and there are 77 coins in all. So you have 66 coins that are not nickels. For the equation, you just have to use the parts we already figured out. If n represents nickels, then either 77 coins minus 66 not nickels is equal to n, or n plus 66 not nickels is equal to 77.
