We can see :

If \(\dfrac{a}{b}< 1\)=> a < b

              => ac < ab

              => a. ( b + c ) < b. ( c + a )

              => \(\dfrac{a}{b}< \dfrac{a+c}{b+c}\)

His age now is :

  44 x 1 : 4 = 11 ( age )

His age when his father is 60 years old is :

 60 - ( 44 - 11 ) = 27 ( age )

=> His age is 27 .

We have : 

\(\dfrac{\left(2016-1\right)+1}{2}.\left(1+2016\right)\)

\(=\dfrac{2016}{2}.2017\)

\(=1008.2017\)

\(=2023056\)

=> 1 + 2 + 3 + ... + 2015 + 2016 = 2023056