Maths help: How many refillings can he do?

Kwhit

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Sep 5, 2013
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A cleaner uses the leftover liquid soap from seven used bottles to refill one empty bottle.
One night the cleaner collects 343 used bottles.
How many refillings can he do with the leftover soap before there is one seventh of a bottle left?

I am at a complete mind blank on how to solve this:
7 used bottles = 1 full bottle

so, 343/7 = 49; 343 used bottles will fill 49 bottles

However, there isnt one seventh leftover? :confused:
 
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