Liam is setting up folding chairs for a meeting. If he arranges the chairs in 7 rows of the same length, he has 5 chairs left over. If he arranges the chairs in 5 rows of that same length, he has 15 left over. How many chairs does Liam have?

Yoi should be writing in explaination:  

Step-by-step explanation:

Write the equation for first arrangement

Write the equation for second arrangement

Write an equation that can be solved to find the number of chairs in a row for which the total number of chairs is same

all the angles opposite to the angle 150 would be 150 and all the angles that are next to 150 are 30 because they equal 180 it you add it up.

step-by-step explanation: