Register
Melissa keeps a jar for holding change. The jar holds 21 coins. All of the coins are quarters and nickels. The total amount in the jar is $3.85. How many quarters are in the jar?
134k views
2 votes
Melissa keeps a jar for holding change. The jar holds 21 coins. All of the coins are quarters and nickels. The total amount in the jar is $3.85. How many quarters are in the jar?

User Aslam Jiffry
by
8.5k points

2 Answers

2 votes
A) n + q = 21
B) .05n + .25q = 3.85
Multiplying A) by -.05
A) -.05n + -.05q = -1.05 then adding this to B)
B) .05n + .25q = 3.85
.20q = 2.80
q = 14 quarters
n = 7 nickels

Check
14q + 7 n = 21 coins
14*.25 = $3.50
7*.05 = $.35
Correct!!!


User Minou
by
7.9k points
0 votes
about 15 coins are quarters
User Dan Lorenc
by
7.6k points
Ask a Question
Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.5m questions

12.2m answers

Other Questions

How do you can you solve this problem 37 + y = 87; y =
What is .725 as a fraction
How do you estimate of 4 5/8 X 1/3
A bathtub is being filled with water. After 3 minutes 4/5 of the tub is full. Assuming the rate is constant, how much longer will it take to fill the tub?
i have a field 60m long and 110 wide going to be paved i ordered 660000000cm cubed of cement  how thick must the cement be to cover field
Link Copied!