63 is 90% of what number? show the equation

Ahigh school has 3636 players on the football team. the summary of the players' weights is given in the box plot. approximately, what is the percentage of players weighing less than or equal to 225225 pounds?

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Solve the following simultaneous equation by using an algebraic method (either substitution or elimination) 2x + 3y=-4 4x-y=11