55.9k views
5 votes
And has some dimes and quarters. If she has 20 coins worth a total of $3.80, how many of each type of coin does she have?

User Hroptatyr
by
8.1k points

2 Answers

5 votes
12 quarters and 8 dimes. Ask me if you have any questions
And has some dimes and quarters. If she has 20 coins worth a total of $3.80, how many-example-1
User Tshallenberger
by
7.8k points
1 vote
d + q = 20.....d = 20 - q
0.10d + 0.25q = 3.80

0.10(20 - q) + 0.25q = 3.80
2 - 0.10q + 0.25q = 3.80
-0.10q + 0.25q = 3.80 - 2
0.15q = 1.80
q = 1.80/0.15
q = 12 <=== 12 quarters

d + q = 20
d + 12 = 20
d = 20 - 12
d = 8 <== 8 dimes
User Milk
by
7.9k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories