Peggy had four times as many quarters as nickels. She had $2.10 in all. How many nickels and how many quarters did she have?

If the variable n represents the number of nickels, then which of the following expressions represents the number of quarters?

The possible answers are:

n/4

n

4n

n + 4

For the answer to the question above,

and we are told that there are "four times as many quarters as nickels"

this translates to

q = 4n

0.05n + 0.25q = 2.10

and

q = 4n

are your two equations that could be used to solve this problem

if you would like to know how many nickels and how many quarters there are, plug in q = 4n into the first equation and get

0.05n + 0.25 (4n) = 2.10

then I would stop here

because I didn't see the choices. So the answer is 4n