Answer:
Mr. Toshio started with 32 rulers
Step-by-step explanation:
Let x be the number of rulers he start with
Mr. Toshio lent out 11 rulers at the beginning of class
Number of rulers - 11
\(x-11\)
He collected 4 rulers in the middle of class. So we add 4
\(x-11+4\)
He gave out 7 at the end of class. So we subtract 7
\(x-11+4-7\)
He had 18 at the end of the day.
\(x-11+4-7=18\)
\(x-14=18\)
Add 14 on both sides
\(x=32\)
Mr. Toshio started with 32 rulers
