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There are 6 black marbles and 4 red marbles in a jar. If you add 4 red marbles to the jar, how many black marbles do you need to add to keep the ratio of black marbles to red marbles the same?

Respuesta :

MrRoyal

You need to add 6 red marbles for the ratio to stay the same

How many black marbles do you need to add?

The given parameters are:

Black = 6

Red = 4

Represent as ratio

Ratio = Red : Black

This gives

Red : Black = 4 : 6

When you add 4 red marbles, we have:

4 + 4 : 6 + x = 4 : 6

Where x represents the additional number of black marbles

This gives

8 : 6 + x = 4 : 6

Multiply 4 : 6 by 2

So, we have:

8 : 6 + x = 8 : 12

By comparing both sides, we have

6 + x = 12

This gives

x = 6

Hence, you need to add 6 red marbles for the ratio to stay the same

Read more about ratio at:

https://brainly.com/question/2784798

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