If s= the number of students in a pe class, which algebraic expression represents the phrase below?

the quotient of the number of students and 3
a: 3s
b: s-3
c: s+3
d: s/3

The quotient is the answer of a division 
answer is D

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post