Question

an alloy is made of 25% copper 30% iron and the rest being zinc find the mass of zinc in 720 gm of the alloy

Answer 1

Copper=25%
Iron=30%
Therefore Zinc=45%
Now 45% of 720g=
=45/100 * 720
=9/2 * 72
=9*36
=324g(Ans)

Answer 2

The percentage of metals another than zinc is 55%. Thus the percentage of zinc in alloy is 45%.
We have the mass of alloy 720gm.
So mass of zinc = 45% of 720gm= 324gm
Thus, Mass of zinc in the alloy is 324 grams.

Hope it helps...
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