Question

the average atomic mass of a sample of an element X IS 23.5 u. What are the percentage of isotopes having atomic mass 23 and 25 

answer？
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Answer 1

Explanation:

23*X/100+25*(100-x)/100

23.5=23x+2500-25x/100

2350=23x+2500-25x

2350-2500=23x-25x

2x=150

X=150/2=75%