can anyone help me with this math problem?

an alloy of copper and tin is 20% copper. how many pounds of copper must be added to 20 pounds of alloy to get an alloy that is 50% copper.

Top 1 Answers

A few days ago

Anonymous

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let x = pounds of copper to be added

0.2*20 = 4 = amount of copper in the 20 pounds of alloy

x + 4 = pounds of copper total

(20 + x) = pounds of the entire alloy

Since you want a 50% copper, you want the total pounds of copper to equal 1/2 of the entire alloy weight

Thus

x + 4 = 1/2(20 + x)

Solve for x

12 pounds of copper needed

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