Explanation:
the answer is how many times does 0.225 l fit wholly into 5 l :
5 / 0.225 = 22.22222222...
so, she can fill 22 glasses fully.
22 × 0.225 = 4.95 l
so, she has at the end (after filling the 22nd glass) 0.050 l (= 50 ml) left.
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