math (sets)

{ 1,2.3,..........,210 }

How many numbers in the above set are multiples of 3 but not 9 ?

a. 46
b. 47
c. 48
d. 69
e. 70

please answer and explain

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  3. 👁 125
asked by Thomas
  1. There are obviously 70 multiples of 3 (210/3 = 70)

    So, how many multiples of 9 are there?

    Figure the difference.

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  2. 210/9=23.333

    so 70-23 =47

    answer b ?

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    posted by Thomas
  3. Looks good to me.

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    posted by Steve

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