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sorry its not clear to me i can't see the top number

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so its (0.15)(20)
(10%)(x)
(0.12)(x+10)

15 * 20 + 10x = 12 ( 20 + x)
@Claire4christ Can you continue?

did you see example above???

If you are talking about your post, then it's WRONG!

that's one of the examples

do you see where it says problem 1 that;s the example

can u explain me than plz

I just show you the result equation, then you solve it yourself!

Multiply the percentage with its mass :)

Is it clear to you now?

300+10x=240=2x

300+240???

60

15 * 20 + 10x = 12 ( 20 + x)
300 + 10x = 240 + 12x

60+10x=2x

Do you understand my calculation above?

yes

Where do you get 60+10x=2x?

300-240???

Now I hope you're fine with x = ...?

30

how did you get 15

15%

I just make your life easier by multiplying all with 100 :)

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