Write a problem to represent: 4x-5=11. identify what the variable represents.

First add 5 to both sides
4x = 16

Now divide both sides by 4
x = 4

Jeffery got $4 allowance each week for x weeks. During those weeks he spent $5 on lunch. At the end of the the weeks he was left with $11. How many weeks were Jeffery's parents giving him allowance.
The answer would be 4 weeks (x=4) and x is the amount of weeks Jeffery got allowances

The answer is 109 times per second