The natural series begins with 43 and ends with 47. These numbers are not included in the interval from which all numbers must be selected. Finding the sum of all composite two-digit numbers from the interval means adding them as terms.
The task can be specified by the inequality: 43 <x <47. Find the sum of all possible x. The numbers are suitable for the solution: 44, 45, 46. It remains to add them and find the sum.
44 + 45 + 46 = (let’s do the calculation in a rational way) 90 + 45 = 135 (final solution).
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