IB Mathematics SL Prep

Answer: 24:7. When comparing distances, we have to “speak the same language”, so we first have to get both distances in a common unit. In this case, convert 8 feet to inches by multiplying by 12, therefore 96 inches. Then, the ratio in inches is 96:28. Reduce the two numbers by 4, which results in a ratio of 24:7.

Key Takeaway: When comparing two quantities, it is important to work in the same unit. It is much easier to compare inches with inches, rather than feet with inches, or minutes to minutes, rather than minutes to days.