Allison made purple paint by mixing 3 parts red paint with 4 parts blue paint. Chris ad 2 fluid ounces of blue paint To match Allison's shade of purple, how much red paint should Chris mix with his blue paint? I got 1.5 because I was doing equivalent ratios and so 3:4 is equivalent to 1.5:2

yes

I say 1.5 because if the ratio 3:4

To determine how much red paint Chris should mix with his blue paint, we can set up a proportional equation based on the ratio provided.

The ratio is 3 parts red paint to 4 parts blue paint. If Chris added 2 fluid ounces of blue paint, we need to find out how much red paint is needed to maintain the same ratio.

Let's call the amount of red paint needed for Chris' mixture "x". The proportion can be set up as follows:

3 parts red paint / 4 parts blue paint = x parts red paint / 2 parts blue paint

Cross-multiplying this equation gives us:

3 * 2 = 4 * x
6 = 4x

Dividing both sides of the equation by 4, we find:

x = 6/4 = 3/2 = 1.5

Therefore, Chris should mix 1.5 fluid ounces of red paint with his 2 fluid ounces of blue paint to match Allison's shade of purple.

To solve this problem, we can use the concept of equivalent ratios. Let's break it down step by step.

First, let's identify the ratio provided: 3 parts red paint to 4 parts blue paint. This means that for every 3 units of red paint, there are 4 units of blue paint.

Next, let's calculate the amount of blue paint that Chris added, which is 2 fluid ounces.

Now, we need to determine the amount of red paint that corresponds to the amount of blue paint Chris added. To do this, we can set up an equivalent ratio.

If 3 parts of red paint are equivalent to 4 parts of blue paint, we can set up the following proportion:

3 parts red paint / 4 parts blue paint = x parts red paint / 2 fluid ounces of blue paint

To solve for x, we can cross multiply:

3 * 2 = 4 * x
6 = 4x

Divide both sides by 4:

6 / 4 = x
1.5 = x

Therefore, the amount of red paint that Chris should mix with his blue paint is 1.5 fluid ounces. So your answer of 1.5 is correct!