x + x + 1 + x + 2 = 3x + 3 = 3 times the middle number
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The sum of three consecutive whole numbers is equal to three times the middle number. For example, if the middle number is "x", then the sum is equal to x + (x - 1) + (x + 1), which simplifies to 3x.
The numbers are 9, 11 and 13.
They are: 146+147+148 = 441
19, 20, 21
The three consecutive even numbers with a sum of 138 are 44, 46 and 48.
It is called a whole consecutive number.