NIMCET 2008 Question Paper with solutions

Question : 89 of 120

Marks: +1, -0

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?

1 : 2
2 : 3
3 : 2
1 : 1

Validate

Solution:

Let the ratio be

λ: 1

then

19 λ+9=15(1+λ)

\Rightarrow

4 λ=6 ⇒ λ=\;{6}/{4} ⇒ λ: 1:: 3: 2

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