Question

in an alloy,the ratio of copper and zinc is 4:5what is the percentage of zinc in it?​

Answer 1

Question:-

in an alloy,the ratio of copper and zinc is 4:5what is the percentage of zinc in it?

${\red{\underline{\underline{\bold{Answer:-}}}}}$

The ratio of Zn & Cu in alloy is 3:4. Let the proportion of Zn &Cu in kg is 3x & 4x kg respectively. So 3x+4x=56,or x=56/7=8kg. The propotion of Zn in the alloy is 3×8=24 kgs & that of Cu is 56-24=32kgs.

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Answer 2

Use the concept of mole and add the masses