twenty eight
Eight of them.
There are 63 numbers 1 to 500 that are divisible by six but not by eight.
150/8 = 18.75 so 18 numbers.
Eight of them.
They are the multiples of twelve from 12 to 96 and there are eight of them
43
There are 12 numbers between 100 and 199 that are divisible by eight: 104, 112, 120, 128, 136, 144, 152, 160, 168, 176, 184 and 192.
24, 32, 40, 48, 56
986 is divisible by these eight numbers: 1 2 17 29 34 58 493 and 986.
There are eight numbers between 0 and 50 that are divisible by three but not by two: 3, 9, 15, 21, 27, 33, 39, 45.