121 is the area of the square
What you want to do is get the variable x on the left side by itself (just like you would if this were an equation). Be sure to perform the same operations on both sides of the inequality until x is all by itself on the left side.
Well if you split 1/4 in half then that will give 1/8. You must also split 0.25 in half which gives 0.125
Now you can multiply that by 5 which gives 5/8. But also the fraction
Now we know that 5/8 = 0.625