Mixing gold
Algebra
Level
pending
Is mixed gold of 12 and 22 carat to get 40 grams of gold of 18 carat. What was the amount of grams 22 k gold used?
24
18
14
20
16
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1 solution
Let's see this:
Carat=12--22--18
Grams=X--40-X--40
Then:
(12 X)+(22 (40-X))=18*40
12X+880-22X=720
160=10X
X=16
We already have 12 carats grams now:
40-X=40-16=24
Answer: Used 24 grams of 22 carat