How many days will a box of 100 test strips last if a member tests before each meal and at bedtime?

To determine how many days a box of 100 test strips will last when a member tests before each meal and at bedtime, we can first calculate the total number of tests conducted in a day. Testing is done before three meals (breakfast, lunch, and dinner), plus one additional test at bedtime, resulting in four tests per day.

Now, we divide the total number of test strips by the number of tests conducted each day:

100 test strips ÷ 4 tests per day = 25 days.

Thus, the correct answer is that the box of 100 test strips will last for 25 days, which confirms the choice provided as the answer. This methodical approach allows us to understand how to deduce the duration that a box of test strips can last based on daily usage patterns.