Total papers: 100 ÷ 0.25 = 400
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- A visualization of research themes shows 40% of papers focus on renewable energy, 25% on sustainable materials, and 15% on smart grids. The remaining 100 papers cover other topics. How many total research papers are included in the visualization?
- Percentage covered: 40 + 25 + 15 = 75%
- Remaining 100 papers = 25% of total
- A Chicago organizer trains 18 youth participants in urban agriculture. Each participant builds 3 raised beds, and each bed requires 120 working hours to prepare. If all participants work the same number of hours, how many total hours are spent across all beds?
- Total beds: 18 × 3 = 54
- Total hours: 54 × 120 = 6,480
