Yes, the ability description is grammatically correct. "65" starts with a consonant sound (sixty-five), so the use of the indefinite article "a" is correct. The use of "an" as the indefinite article for "80" (eighty) is also correct, as it starts with a vowel sound.
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Agreed.
I got bored and found that out. I was REALLY bored
Yes. Another 5 for 15% it should be 2