Tolong jawab nomor 12-15 ya... Please jangan ngasal Terimakasih

12.) C/5 = R/4
40/5 = R/4
40 x 4 = 5 x R
160/5 = R
32 = R (A)
13.) C/5 = F-32/9
60/5 = F-32/9
12/1 = F-32/9
12 x 9 = F-32
108 = F-32
108 + 32 = F
140 = F (D)
14.) X =212 Y = 0 Z =373 (B)
15.) maaf no 15 gak bisa :)