400
124 4th-graders started school. Throughout the year, several students, s, moved. At the end of the year 118 students were signed up for 5th grade. How many students moved during the year?
Which equation will help solve the problem?
A. 124 + s = 118
B. 124 - s = 118
C. 124 x s = 118
D. 124 ÷ s = 118
What is B? (124 - s = 118)