Nick's class has 30 students. 2/5 of his class sings in the choir. How many students sing in the choir?

Multiply 2/5 by 30

2/5*30/1=60/5

now simplify

divide both the numerator and the denominator by 5, and that is equal to 12/1, which is just 12.

so 12 students sing in the choir.