Bronze has 80% copper and 20% tin. How much copper will we need to produce bronze if we have 39kg of tin?

Correct answer:

a =  156 kg

Step-by-step explanation:

b=39 kg a:b =  80 %:20 % = 80:20 = 8:2  a=b 28=39 28=239 8=2312=156 kg

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