Question

you want to determine how many minutes are in one day. what choice goes in the green box?
1 day | ? |
------|-------|------
1 day |
24 hours
60 minutes
1 day
1 hour

Explanation:

Step1: Identify unit conversion link

We need to convert days to hours first, since 1 day = 24 hours. The green box is part of a conversion factor where the denominator is 1 day, so the numerator should be the equivalent in hours.

Step2: Match to correct option

The conversion factor to cancel "day" units is $\frac{24\ \text{hours}}{1\ \text{day}}$, so the green box holds 24 hours.

Answer:

A. 24 hours