Ratio: מציאת יחס לפי הנתונים

To find the ratio of flour to sugar, divide the amount of flour by the amount of sugar.
Thus, we have $\text{flour:sugar} = \frac{400}{200} = 2:1$.
Therefore, the ratio of flour to sugar is $2:1$.

To find the ratio of apples to oranges, divide the number of apples by the number of oranges.
Therefore, $\text{apples:oranges} = \frac{15}{10} = 3:2$.
Thus, the ratio of apples to oranges is $3:2$.

To solve this problem, we'll follow these steps:

• Step 1: Identify the number of fingers, which is typically 10.
• Step 2: Identify the number of toes, which is also typically 10.
• Step 3: Write the ratio of fingers to toes.
• Step 4: Simplify the ratio.

Now, let's work through each step:
Step 1: The typical number of fingers on a human is $10$.
Step 2: The typical number of toes on a human is $10$.
Step 3: The ratio of fingers to toes is $10:10$.
Step 4: Simplifying this ratio $10:10$ gives us $1:1$.

Therefore, the solution to the problem is $1:1$, which corresponds to answer choice 4.