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NIELIT 2022 Feb Scientist D - Section C-9

 

Gold is $19$ times as heavy as water and copper $9$ times as heavy as water. In what ratio should the metals be mixed so that the mixture may be $15$ times as heavy as water ?

  1. $3: 2$
  2. $9: 5$
  3. $2: 3$
  4. $7: 5$
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