When the beats divide into twos, the music is said to be in simple time;
Source: The AB Guide to Music Theory, page 19, in the last paragraph
But I don't understand why is the 3/4 time signature also in simple time, since 3 can not be divided by two.
In this answer it says that:
divide 2 into 4, giving the answer 2
And in this definition:
(of a number) be contained in a number without a remainder.
"3 divides into 15"
Then I guess that "divide 2 into 4 without a remainder" amounts to "2 divides into 4", and hence "the beats divide into twos" means "twos can be divided by the beats with no remainder". But does that statement make sense?