Did you post all of the question? The mass of 22X should be a little less than 22, the mass of 23X should be a little less than 23 and the mass of 25X should be a little less than 25.
(mass 22X*0.60) + (mass 23X*0.35) + (mass 25X*0.05) = Y. Solve for Y.
Element X has three isotopes, ^22X, ^23X, and ^25X. The relative abundances are 60%, 35%, and 5% respectively. What is the average atomic mass foe element X?
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