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Q.

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 15 times as heavy as water?

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a

1 : 2 

b

1 : 1 

c

2 : 3 

d

3 : 2 

answer is D.

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Detailed Solution

Gold: Wa = 19:1

 Copper:Wa = 9:1

Let 1 gram of gold be mixed with x grams of copper.

Question Image

 

Ratio mixed = 1:x = 1:2/3 = 3:2


 

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