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Answer 1

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Answer 2

Hello friend!
18
Let the percentage of X be 'x',
8
then the percentage of other one is (100-x)

Average atomic mass of the element = 16.2u
So, 16.2 = x * 18/100 + (100 - x) * 16/100
16.2 = 18x / 100 + 1600 - 16x / 100
16.2 = 18x + x 1600 - 16x / 100
16.2 * 100 = 2x + 1600
1620 = 2x + 1600
2x = 1620 - 1600
2x = 20
x = 20/2
x = 10
Now, 18
Percentage of X = 10℅
8
16
Percentage of X = (100 - 10)℅
8 =90℅