An alloy of metal contains 45% nickel, 25% copper and rest is zinc . How much % zinc is there in the alloy ?

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Solution

Alloy $45 %$ Nacket $= \frac{45}{100} = \frac{9}{20}$

$25 %$ copper $= \frac{25}{100} = \frac{1}{4}$

Zinc $= 100 - (45 + 25)$

$= 100 - 70$

$= 30 %$ .

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