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Ar x = (x/100 . 20) + (100-x/100 .22)
20,2 = (x/100 . 20) + (100-x/100 .22) (kedua ruas dikali 100)
2020 = x.20 - 22x + 2200
2x = 2200 - 2020
x = 90, jadi kelimpahannya di alam sebesar 90%
Kelimpahan Cu
Ar Cu = (x/100. 63) + (100-x/100. 65)
63,5 = (x/100. 63) + (100-x/100. 65) (kedua ruas dikali 100)
6350 = 63x - 65x + 6500
2x = 150
x = 75, jadil kelimpahannya dialam sebesar 75%