Peggy had three times as many quarters as nickels. she had $1.60 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?

Let

n> the number of nickels

q> the number of quarters

we know that

1\ quarter=\$0.25\\1\ nickel=\$0.05

so

0.05n+0.25q=1.60 > equation A

q=3n > equation B

substitute equation B in equation A

0.05n+0.25[3n]=1.60

0.05n+0.75n=1.60

0.80n=1.60

n=2

Find the value of q

q=3*2=6

therefore

The answer part a) is

the number of nickels are  2  and the number of quarters are 6

the answer Part b) is

The expressions that represents the number of quarters is

q=3n

Step-by-step explanation:

the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

step-by-step explanation: