1. The problem is to convert $d$ days into hours. 2. We know that 1 day equals 24 hours. 3. To convert days to hours, multiply the number of days by 24. 4. The formula is: $$\text{hours} = d \times 24$$ 5. So, if you have $d$ days, the equivalent hours are $24d$. 6. This means for any value of $d$, multiply by 24 to get the hours.