210k views
2 votes
There is a jar of green and red marbles. If there are 21 marbles total and the ratio of green to red is 3:4, how many red marbles are there?

User Mukunda
by
8.5k points

2 Answers

5 votes

Answer:

12 red marbles

Explanation:

You make an equation: 3x+4x=21

Then, you get 7x=21.

By using algebra, you get x=3.

Then you muliply 3 by 4 since the ratio of red marbles is 4.

So you get 12.

User Saljuama
by
7.9k points
3 votes

Answer:

There are 12 red marbles

Explanation:

green : red : total

3 4 3+4=7

We want a total of 21

21 /7 =3

Multiply by 3

green : red : total

3*3 4*3 7*3

9 12 21

User Tri Bui
by
9.0k 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