Answer:
C. 20480
Explanation:
You would just have to keep multiplying by 2:
20-10 40-20 60-40 80-80 100- 160 120-320 140-640 160- 1280 180-2569 200-5120 220-10240 240-20480
Answer:20480, 3rd answer
5*2*2 and so on, do on calc to double check
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