Others Maths Puzzle

if 6x43-46y9=1904
4
6
cannot bedetermined
none of these

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Others Other Question

One litre of water is added to 10 litres of a 40% solution of alcohol in water. What is the final strength of the alcohol Ralph likes 25 but not 24; he likes 400 but not 300; he likes 144 but not 145. Which does he like:(a)10 (b)50(c)124(d)200(e)1600