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Original fuel efficiency: 240 / 8 = 30 mpg
Reduced efficiency: 30 × 0.90 = 27 mpg
Gallons needed for 360 miles: 360 / 27 ≈ 13.33
#### 13.33
The ratio of boys to girls in a class is 3:4. If there are 12 more girls than boys, how many students are in the class?
Let number of boys = 3x, girls = 4x
4x - 3x = 12 → x = 12
Total students: 3x + 4x = 7x = 7 × 12 = 84
A smartphone depreciates in value by 15% per year. If purchased for $1,200, what will its value be after 3 years?
Value after year 1: $1200 × 0.85 = $1020