Question

think about the process a jar contains only pennies, nickels, dimes, and quarters. there are 14 pennies, 20 dimes, and 23 quarters. the rest of the coins are nickels. there are 79 coins in all. how many of the coins are not nickels? if n represents the number of nickels in the jar, what equation could you use to find n?
______
□ of the coins are not nickels.
which of these equations could you use to find n?
a. ( n + 56 = 79 )
b. ( n - 65 = 79 )
c. ( n + 65 = 79 )
d. ( n + 57 = 79 )
e. ( n - 59 = 79 )
f. ( n + 59 = 79 )

Explanation:

Step1: Calculate non-nickel coins

$14 + 20 + 23 = 57$

Step2: Set up equation for total coins

Let $n$ = number of nickels. Total coins: $n + 57 = 79$

Answer:

57 of the coins are not nickels.
D. $n + 57 = 79$