How do you find the percent abundance when given the atomic mass?

How do you find the percent abundance when given the atomic mass?
Specifically in the following problem:
The element Boron exists as B-10 and B-11. The atomic mass of B-10 is 10.001 amu and the atomic mass of B-11 is 10.998 amu. If the average atomic mass of a mixed sample is given as 10.81 amu, what is the percent abundance of each isotope?
I understand that the equation would be x+y=1, which would be 10.001x+10.998y=10.81 but I’m not sure how to continue. Many thanks!
Best answer:
Answer by darkwater d
You need one more piece of information, one of the percentages.
Know better? Leave your own answer in the comments!
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