Question: What is the remainder when the sum of the first 7 pollution index values (starting at 10, increasing by 5 each month) is divided by 9?

Thu, 16 Apr 2026 11:00:07 +0000

**What is the remainder when the sum of the first 7 pollution index values (starting at 10, increasing by 5 each month) is divided by 9?** Curious about how environmental data shapes our understanding of air and urban health? A growing number of users are exploring patterns in pollution indices—not just raw numbers, but how those numbers grow and interact with basic math. One common query reflects this trend: What is the remainder when the sum of the first 7 pollution index values (starting at 10, increasing by 5 each month) is divided by 9? At first glance, this question blends environmental awareness with foundational math, revealing a quiet but meaningful interest in tracking ecological changes through practical data analysis. Now, why is this question gaining quiet traction? Across U.S. cities, pollution data is no longer abstract—it informs public health decisions and community planning. As awareness rises around urban quality of life, people are seeking clear ways to interpret environmental metrics. Breaking down a series like pollution index values growing by 5 each month offers insight into predictable, measurable environmental shifts. The mathematical operation—finding a remainder—adds structure, helping users grasp patterns beyond raw numbers. Dividing the cumulative sum of these values by 9 transforms the data into a digestible index, useful for trend comparisons and forecasting. **Understanding the Calculation**