SOLUTION: How much of an alloy that is 30% copper should be mixed with 200 ounces of an alloy that is 70 % copper in order to get an alloy that is 50 % copper this is what I came up with.

Question 855701: How much of an alloy that is 30% copper should be mixed with 200 ounces of an alloy that is 70 % copper in order to get an alloy that is 50 % copper
this is what I came up with...is this right
x(30%)+(200)(70%)=200+x(50)
.3x+140=100+.5x
40=.2x
x=200
Answer by josgarithmetic(39617) (Show Source): You can put this solution on YOUR website!
x how much to add or use

Your initial setup seems good. Maybe you let the switch to decimal fractions confuse you?

, and in fact this works as correct when tried as a check in our original equation.

(Seemed strange to me also, ...until examining the AVERAGE of 30 and 70. Their middle value IS 50.)
RELATED QUESTIONS
How much of an alloy that is 30% copper should be mixed with 200 ounces of an alloy that... (answered by scott8148)

how much of an alloy that is 30% copper should be mixed with 200 ounces of an alloy that... (answered by ewatrrr)

how much of an allow that is 30% copper should be mixed with 200 ounces of an alloy that... (answered by Alan3354)

How much of an alloy that is 20% copper should be mixed with 400 ounces of an alloy that (answered by ankor@dixie-net.com)

How much of an alloy that is 20% copper should be mixed with 200 ounces of an alloy... (answered by checkley71)

How much of an alloy that is 20% copper should be mixed with 200 ounces of an alloy that... (answered by Fombitz)

how much of an alloy that is 30% copper should be mixed with 200 ounces of an alloy that... (answered by mananth)

How much of an alloy that is 10% copper should be mixed with 200 ounces of an alloy that... (answered by josgarithmetic,ikleyn)

How much of an alloy that is 20% copper should be mixed with 600 ounces of an alloy that... (answered by Fombitz)

How much of an alloy that is 10% copper should be mixed with 500 ounces of an alloy that... (answered by jorel1380)