To determine the correct proportion that describes the relative amounts of each color, let's simplify the ratios for both groups of children.
For the first group:
- Red blocks: 15
- Green blocks: 45
The ratio of red to green for the first group simplifies to: \[ \frac{15}{45} = \frac{1}{3} \]
For the second group:
- Red blocks: 30
- Green blocks: 90
The ratio of red to green for the second group simplifies to: \[ \frac{30}{90} = \frac{1}{3} \]
Both groups have the same ratio of red to green blocks, which is \( \frac{1}{3} \).
Now looking at the options, the correct proportions are:
- \( \frac{15}{45} = \frac{30}{90} \)
- \( \frac{15}{45} \) simplifies to \( \frac{1}{3} \)
So the correct response is: \[ \frac{15}{45} = \frac{30}{90} \]
This option states the relation between the proportions clearly.