Question

An alloy contains 30% copper, 40% zinc and remaining is nickel. Find the amount of nickel in 20 kg of the alloy

Answer 1

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Let the total amount of alloy = 100%

copper = 30%   

zinc = 40%

then Nickel = 100-(30+40)

                    = 100 - 70 = 30

the amount of nickel in the  alloy = 30/100 * 20= 6 kg

                              

                             also copper is = 30/100 * 20 =  6 Kg

                                         Zinc       = 40/100*20 =   8 kg

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Answer 2

The answer is

30% zinc