Question 129542
Make an equation.  "of" means multiplication.  3/8 of (class)=12, so (3/8)x=12.  Solve by multiplying by the reciprocal.
(8/3)(3/8)x=12(8/3)
x=4*8
x=32. There are 32 students in this class.
Check: If there are 32 students, that makes 8 groups of 4.  So 3/8 is 3*4=12. Yay!