1 answer:
2 x 3 = 6 + 3 x 3 = 9. 6 +9= 15 + 5 = 20. 10 + 15 = 25.
So, The Al2 O 3 is 20.
And the Fe is 15?
So the total of whatever it is is 25.
Sorry if it's wrong, I am a 13year old 7th grader, not in high school so it's probably wrong.
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