Question

If an alloy of metal contains 45% nickel, 25% copper and rest is zinc, then the weight of zinc in 3kg alloy is

Answer 1

HEY......

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CONCENTRATE ...
ALLOY IS 100%

RIGHT?

45% NICKEL + 25% COPPER + X% ZINC= 100%

70% + ZINC = 100%

ZINC = 100-70

ZINC=30%

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NOW .....

WE HAVE GIVEN THAT ZINC IS 3 KG....

IF 30%=3KG
SO 100%=?

=100*3/30

=10

SO THE ALLOY WAS OF 10 KG

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Answer 2

45%metal 25%copper
then, the total alloy
=(45+25) %
=70%

so,
=(100-70) %
=30%

it is asked the weight of the zinc in 3 kg alloy
=100*3/30
=10