Question: A grocer sold a number of apples over a few months. The grocer made the following graph to present the number of apples remaining over the months. Find the number of apples sold between February to April.
1. **State the problem:** We need to find the number of apples sold between February and April based on the graph showing the number of apples remaining each month.
2. **Read values from the graph:** From the graph, the number of apples remaining in February is approximately $900$ and in April is approximately $600$.
3. **Formula used:** The number of apples sold between two months is the difference in the number of apples remaining at the start and end of that period.
$$\text{Apples sold} = \text{Apples in February} - \text{Apples in April}$$
4. **Calculate:**
$$\text{Apples sold} = 900 - 600 = 300$$
5. **Interpretation:** The grocer sold $300$ apples between February and April.
**Final answer:** $300$ apples were sold between February and April.