an alloy contains 40% copper, 32% nickel and rest zinc. find the mass of zinc in one kilogram of the alloy.

Given: The alloy contains 32% of copper 40% of nickel Remaining zinc Mass of alloy = 1kg = 1000 grams Mass of copper in alloy = (1000/100) × 32 = 320 grams Mass of nickel in alloy = (1000/100) × 40 = 400 grams Hence, mass of zinc in alloy = 1000 – (320 + 400) = 1000 – 720 = 280 grams Therefore the mass of zinc in 1kg of the alloy is 280 grams.

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