It is given in the question that
Evan has 356 stuffed animals, all of the which are either monkeys or giraffes. The number of giraffes he owns is 17 more than twice the number of monkeys.
Let the number of monkeys be x. Therefore number of giraffes are
[tex]2x+17[/tex]
And total number of animals are 356.
That is
[tex]x+2x+17=356 \\ 3x+17=356[/tex]
Subtracting 17 from both sides ,
[tex]3x=339[/tex]
Dividing both sides by 3
[tex]x = 113[/tex]
Therefore the number of monkeys are 113 .