Question 1144195
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Let x be the David's age.


Then Peter is (x-2) years old, while John is (x-5) years old.


The total of their ages is 44, which gives you an equation


    x + (x-2) + (x-5) = 44,

Or

    3x - 7 = 44,

    3x = 44 + 7 = 51,

     x           = 51/3 = 17.


<U>ANSWER</U>.  John's age is  x-5 = 17-5 = 12 years.
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This problem deserves to be solved in short, &nbsp;simple and clear form.


As any other problem, &nbsp;too . . .