You can start by dividing by smaller numbers first, and you would get an answer of 3 if you divided 4455 by 1485 as well as both denominators.
The base angles of an isosceles trapezoid are equal. Therefore:
20x + 9 = 14x + 15
6x = 6
x = 1
So, the base angles both equal 29 degrees.
In a trapezoid, the sum of the angles attached to the same leg always = 180 degrees.
Therefore, angle K and angle L equal 151 degrees.
0.225, 23%, 1/4
Step my step
23% = 0.23
1/4 = 0.25
There's no way to know this without knowing the number of pencils he started with