The answer will depend on the value of W, which has not been specified.
12 of them.
There are 5 multiples of 9. There are 4 multiples of 12. There is 1 number that is a multiple of both, 36.
12 of them.
32 of them.
One
All nonzero numbers have an infinite number of multiples.
There are seven multiples of six that fall between one and 50: 12, 18, 24, 30, 36, 42, 48.
There are four: 6, 12, 18, 24.
12, 24, 36, 48 - the multiples of 12.
That's the same as asking how many multiples of 12 are between 1 and 150 and since 12 x 12 = 144, your answer is 12.
The multiples of 2 between 7 and 15 are 8, 10, 12, and 14.
There are six multiples of both 2 and 3 that fall between 1 and 40. They are: 6, 12, 18, 24, 30, 36.