The ratio of 7th to 8th graders in a play is 2:3. There are 30 students in the play. How many are 8th graders?

How do you work this problem is like this
2/3 x30/1=60/2=20 is this right

No, it's not right.

Use a proportion.

3/5 = x/30
5x = 90
x = 18 eighth graders

Always look at your previous posts before reposting, so it

doesn't lead to unnecessary work on the part of tutors.

https://www.jiskha.com/questions/1784954/The-ratio-of-7th-to-8th-graders-in-a-play-is-2-3-There-are-30-students-in-the-play

Yes, your approach to solving the problem is correct. Let me explain how to arrive at the answer step by step.

Given that the ratio of 7th to 8th graders in the play is 2:3, we can set up a proportion to find the number of 8th graders.

Let's assume that the number of 7th graders is 2x, and the number of 8th graders is 3x. Since the total number of students in the play is 30, we can write the equation:

2x + 3x = 30

Combining like terms, we have:

5x = 30

Next, divide both sides of the equation by 5 to isolate x:

x = 30/5
x = 6

Now, plug this value of x back into the expressions for the number of 7th and 8th graders:

Number of 8th graders = 3x = 3 * 6 = 18

Therefore, there are 18 8th graders in the play.