SOLUTION: Consider all whole numbers from 1 to 9000. How many numbers are divisible by 10 but not by 9? How many numbers are divisible by 2 or 3 (this should include those divisible by both

Algebra ->  Divisibility and Prime Numbers -> SOLUTION: Consider all whole numbers from 1 to 9000. How many numbers are divisible by 10 but not by 9? How many numbers are divisible by 2 or 3 (this should include those divisible by both       Log On


   

Question 979917: Consider all whole numbers from 1 to 9000. How many numbers are divisible by 10 but not by 9? How many numbers are divisible by 2 or 3 (this should include those divisible by both 2 and 3)? Any help would be greatly appreciated.
Answer by solver91311(24713) About Me  (Show Source):
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9000 divided by 10 is 900, so 900 of the numbers from 1 to 9000 are divisible by 10. 900 divided by 9 is 100, so 100 of the numbers divisible by 10 are also divisible by 9. Therefore 800 of the numbers from 1 to 9000 that are divisible by 10 are NOT divisible by 9.

If something is divisible by 2 AND 3, then it must be divisible by 6.

John

My calculator said it, I believe it, that settles it