Urgent (Medal): An alloy is composed of two parts copper (Cu) to one part aluminum (Al). How much of each metal is needed to make 105 lb. of the alloy?

Thanks c:

Question

Urgent (Medal): An alloy is composed of two parts copper (Cu) to one part aluminum (Al). How much of each metal is needed to make 105 lb. of the alloy?

Thanks c:

anonymous · Answer

The ratio is given to you, for 2 parts of Cu, one part of Al is used..

So:

$$\frac{Cu}{Al} = 
\frac2{1}{}$$

anonymous · Answer

And $Cu : Al = 2 : 1$

Let the amount of $Cu$ used is : $2x$
So, the amount of $Al$ used is : $x$..

anonymous · Answer

When ratio is given, let the quantity given to you according to ratios only..

anonymous · Answer

So, $2x + x = 105$

$3x = 105$

Find $x$ from here.. $x$ is your $Al$, for $Cu$, find $2x$..

anonymous · Answer

And I am not typing.. :P

butterflyhope · Answer

So:
Aluminum = 3x = 105
Divide 3 on both sides, so you're left with x = 35.

Copper: 2x = 105
Divide 2 on both sides, so you're left with x = 52.5?

butterflyhope · Answer

@waterineyes

anonymous · Answer

No..

anonymous · Answer

you have found $x= 35$ which is right..

Find $2x$ for $Cu$ means : Multiply $x$ with 2 after finding $x$.. :P

anonymous · Answer

Getting?

anonymous · Answer

If $x = 35$, then what is $2x$ ??

butterflyhope · Answer

70?

butterflyhope · Answer

So you need 70% copper and 35% aluminum?

anonymous · Answer

yep

butterflyhope · Answer

Thx ^-^

anonymous · Answer

So, amount of Copper : 70 lb
    amount of Aluminium : 35 lb.

anonymous · Answer

$\text{This is it...}$