SAT Math Multiple Choice Practice Question 51: Answer and Explanation
7. How many hours are in w weeks and d days?
A. 7w + d
B. 168w + 24d
C. 24w + 168d
D. 168w + d
E. 7w + 24d
Correct Answer: B
B. You know there are 24 hours in a day, so to find the number of hours in a week, calculate 24 hours × 7 days = 168 hours. Now you have 168w hours. Add 24d for the leftover days. Another approach: In w weeks and d days, there are 7w + d total days. Multiplying by 24 hours in a day gives you 24(7w + d), and distributing gives you 168w + 24d.