Elitmus Exam Numerical Ability Ratio and Proportion

a liquid p is 10/7 times heavy as water and water is 7/5 times as heavy as another liquid q.the mount of p that must be added to 7 liters of liquid q so that the mixture weighs as much as an equal volume of water will be

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Elitmus Other Question
a barrel contains a mixture of wine and water in the ratio of 3:1.how much fraction of the mixture must be drawn off and substituted by water so that the ratio of wine and water in the resultant mixture in the barrel becomes 1:1 gold is 19 times as heavy as water and copper is 9 times as heavy as water .in what ratio should these be mixed to get an alloy 15times as heavy as water?