There are 2333 of them. I'll do the first ten.
3, 6, 9, 12, 15, 18, 21, 24, 27, 30 and just keep adding three until you get to 699.
The least common multiple of 7000 , 392 = 49,000
There are int(7000/9) = int(777.77...) = 777 of them.
70, 700, 7000, 70000, 77
700 and 7000 are two examples.
To calculate the average of two numbers, add them together, and divide the result by 2. (For the average of three numbers, you add up the three numbers, and divide by three, etc.) The average is (5000 + 7000)/2 = 6000
The infinite set of numbers which are multiples of three. The infinite set of numbers which are multiples of three. The infinite set of numbers which are multiples of three. The infinite set of numbers which are multiples of three.
If half of the sum is 90 then the full sum must be 180. The three consecutive multiples of 10 which add up to 180 are 50, 60 and 70.
The sum of three consecutive multiples of 6 is 666, the multiples are 216, 222 and 228.
Three multiples of 100 are 100, 200, and 300.
24, 36, 48
650, 700 and 750 are three consecutive multiples.
The first three multiples of 99.