Question 289852: How many two digit positive integers are multiples of 3 and/or 7?
(a)33 (b) 35 (c) 37 (d) 39 (e) None of these
Answer by richwmiller(17219)   (Show Source):
You can put this solution on YOUR website! multiples of 3 and 7
3*7=21
21
42
63
84
there are 4
multiples of
7
7,14,21,28,35,42,49,56,63,70,77,84,91,98
14 multiples
10-99
3,6,9 less than 10
99/3=33
30 multiples of 3 between 10 and 99
14 multiples of 7
98/7=14
14-1=13
30+13-4=39
answer D)
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