Lily is conducting a range test on her new electric vehicle (EV). When she started her journey, thedashboard showed a full battery at 100%. After the first leg of the trip, the battery level dropped to 55%. By the time she completed the second leg and reached her destination, the battery level had further decreased to 30%. Given that the two legs of the trip totaled 210 kilometers, what is the estimated total driving distance, in kilometers, of the EV on a full charge, assuming constant energy efficiency ?
A. 280
B. 300
C. 350
D. 420
E. 700

Fraction and percentage word problems中文
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Worked solution

1. 2026 AMC 8 官方解析

电量降至30%相当于用了1−30%=70%1 - 30\% = 70\%的电，
210÷70%=300（公里）210 \div 70\% = 300\text{（公里）} .

Answer

B. 300

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