Gold is 19 times as heavy as water and copper is 9 times as

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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 ?

[SSC GD 2012 Shift 2]

A 1 : 1

B 2 : 2,

C 1 : 2,

D 3 : 2,