Question

an old potato outputs 1/3 of a volt of electricity, which is 1/3 the amount of power needed for a small lightbulb. How many potatoes would you need to power the lightbulb

Answer 1

The answer is three.

Heres why.

1/3 = 1/3 needed

So that means 1/3 +1/3 + 1/3=1  and that means you have 3 1/3s

That is why the answer is 3. 
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Hope this helped