1) If A3=B4=C5, then A:B:C is : A) 3:4:5 B) 2:1:4 C) 4:5:7 D) 6:4:8 E) 5:4:2 Answer: Option AExplanation:Let A3=B4=C5=k. Then,A=3k, B=4k and C=5kA:B:C =3k:4k:5k =3:4:5