The ratios of students to teachers atención school is 20: 1. how many students are there in a school with 12 teachers

So the premise is that there are 20 students for every teacher. If you have 12 teachers then you would multiply 20 by 12 and get 240 students in total.

1:20

12:240

answer; gender and sexuality;

i'm not sure i completely understand your question, but i will do my best.

i think the answer you are looking for is sequence. (see below)

a repeated melodic fragment would be best defined as repetition, while repeated chords (different or the same) could be a chord progression. however, you then mentioned the chord and melodic fragment beginning on higher or lower pitches, in that case, the answer could be best defined as a sequence. the definition of a sequence is as follows: "the restatement of a motif or longer melodic (or harmonic) passage at a higher or lower pitch in the same voice."

let me know if this !