The highest common factor of 21 and 50 is just 1
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a number is divisible by 12 if the number is also divisible by both 3 and 7. You mean a number is divisible by 21 if it is divisible by 3 and 7.
How many numbers less than 700 are divisible by both 15 and 21?
21 numbers - if you include the 10 and the 50.
Odd multiples of 7 less than 50 are numbers that are both odd and divisible by 7, and are less than 50. The odd multiples of 7 less than 50 are 7, 21, and 35. These numbers are odd because they are not divisible by 2, and they are multiples of 7 because they can be divided evenly by 7.
No, they are not. Both are divisible by 3.