To maintain the ratio of grapes to blueberries from the table provided, we can first determine the consistent ratio from the values given.
From the table, we see that:
- For every 2 cups of grapes, there are 1 cup of blueberries.
- Thus, the ratio of grapes to blueberries is 2:1.
Now, if Mandie is making 15 cups of fruit salad, we need to maintain this ratio of 2:1. This means for every 2 parts of grapes, there is 1 part of blueberries.
The total parts in the ratio (2 parts grapes + 1 part blueberries) is: 2 + 1 = 3 parts.
Now, we can find out how many cups each part represents by dividing the total cups of fruit salad by the total parts: 15 cups ÷ 3 parts = 5 cups per part.
Now we can calculate the actual amounts of grapes and blueberries:
- For grapes (2 parts): 2 × 5 = 10 cups of grapes.
- For blueberries (1 part): 1 × 5 = 5 cups of blueberries.
Thus, the ratio of grapes to blueberries is: 10 cups of grapes : 5 cups of blueberries, which simplifies to 2:1.
Among the choices given, we notice that there is no 2:1 ratio directly listed, but we can verify the final choice:
- 10:5 simplifies to 2:1, confirming that this is indeed the correct ratio.
Therefore, Mandie should use the ratio 10:5 for grapes to blueberries in her fruit salad.