Peter has a jug of water. He pours 400 ml into a cup. The ratio of water in the jug to that in the cup is 9 : 2. How much water was in the jug to start with?
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X=amt of water in jug
(X-4/10x) /4/10x=9/2
(X-4/10x) /4/10x=9/2
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