If M + N means M × N, M × N means M - N, M - N means M ÷ N, and M ÷ N means M + N, what is the result of 9 + 3?

A. 27

If R ÷ S means R - S, R - S means R + S, R + S means R × S, and R × S means R ÷ S, what is the value of 15 ÷ 3?

A. 5

If A=1, B=2, C=3, ..., Z=26, what is the code for the word 'CAT'?

A. 3-1-20