If 12|20 = α|5 = 9|b = then α + 2b aqual to..

12/20 = a/5
a = 5 x (12/20)
a= 12/4
a=3

a/5= 9/b
3/5= 9/b
b = 9x(5/3)
b= 15

a+2b= 3+2×15 = 33

soal di video jerome nihongo mantappu wkwk