Question

$a \: container \: is \: one \: fifth \: full \: of \: water \: if \: 40 \: litres \: of \: water \: is \: requrid \: to \: fill \: it \: up \: completely \: then \: what \: is \: the \: capacity \: of \: the \: container$
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Answer 1

I think 40 liters?????????