A school counselor had some pencils to give to students.
On Monday morning, the principal gave 150 more pencils to the counselor.
On Tuesday, the counselor bought 85 additional pencils.
The counselor now has 275 pencils.
Create a strip diagram (in the "show your work" section) to model how to find the number of pencils the counselor had to begin with.
Select the equation that represents how to find the number of pencils the counselor had to begin with.