An alloy of copper and zinc which contains 5 grams of zinc. If 15 grams of zinc are added to this alloy, a new alloy is obtained in which the copper content has been reduced by 30% from the original. Find the initial mass of the alloy

Initial mass = 25 grams

Step-by-step explanation:

x = 20 (mass of copper)

percent

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step-by-step explanation:

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