For a number to be wholly divisible by 3, 4 & 5 it must also be divisible by the Lowest (or least) Common Multiple of these numbers which is 3 x 4 x 5 = 60.
Consequently, the numbers you require are multiples of 60. (ie 60, 120, 180, 240 etc)
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There are 466 numbers between 1 and 1,000 that are divisible by three or five.
The least common multiple of all of these numbers is 360. This is the smallest number that is divisible by all five numbers. Any whole number multiple of 360 will also be divisible by all five numbers, so:2 x 360 = 7203 x 360 = 10804 x 360 = 1440, etc.
555 also 110 is divisible by five and the answer is 22
625 is divisible by these five numbers: 1, 5, 25, 125, 625.