Question

please answer this question...​

Answer 1

Explanation:

let percentage of one be x

so another is 100-x

80.4=(79x+8100-81x)/100

8040=8100-2x

2x=60

x=30

so the percentage of isotope of atomic number 79 is 30 and other is 70

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Answer 2

Answer:

I hope it helps you

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