It is given that the sum of their ages are 91.
It is also given that Gabriele is 15 years older than Mikhail age.
Let Mikhail age be x and Gabriele age be y.
The equation formed is
[tex]y=x+15[/tex][tex]y-x=15[/tex]
Another equation is
[tex]x+y=91[/tex]
Solve the two equations to determine the value of x and y
[tex]2y=106[/tex][tex]y=53[/tex]
Substitute the value of y in the equation to find x
[tex]x+53=91[/tex][tex]x=38[/tex]
Hence the age of Mikhail is 38 year and Gabriele age is 53 year.
