How many dates in 2011 are a multiple of 10? (A date in the case is a month and day, such as May 20.)

To determine how many dates in 2011 are a multiple of 10, we can break the problem down into the following steps:

1. Identify the range of dates in 2011: January 1, 2011, to December 31, 2011.
2. Determine the number of days in each month of 2011.
3. Iterate through each date within the range and check if it is a multiple of 10.
4. Count the number of dates that meet the criteria.

Step 1: Identify the range of dates in 2011

In 2011, the year runs from January 1, 2011, to December 31, 2011. Therefore, we need to consider all the dates within this period.

Step 2: Determine the number of days in each month of 2011

Since the number of days in each month varies, we need to determine the number of days in each month of 2011. Here is a breakdown:

- January: 31 days
- February: 28 days (non-leap year)
- March: 31 days
- April: 30 days
- May: 31 days
- June: 30 days
- July: 31 days
- August: 31 days
- September: 30 days
- October: 31 days
- November: 30 days
- December: 31 days

Step 3: Iterate through each date within the range and check if it is a multiple of 10

Now we can iterate through each date within the range (January 1, 2011, to December 31, 2011) and check if it is a multiple of 10. To do this, we need to evaluate both the month and day.

Step 4: Count the number of dates that meet the criteria

Finally, we count the number of dates that satisfy the condition of being a multiple of 10.

By following these steps, you would determine the exact number of dates in 2011 that are a multiple of 10.