If A : B = 2 : 3 and B : C = 4 : 5 then A : B : C is
A. 2 : 3 : 5
B. 5 : 4 : 6
C. 8 : 12 : 15
D. 6 : 4 : 5
Answer: Option C
Solution (By Examveda Team)
$$\eqalign{ & \frac{{\text{A}}}{{\text{B}}} = \frac{2}{3} \cr & \frac{{\text{B}}}{{\text{C}}} = \frac{4}{5} \cr} $$ A : B : C = 2 × 4 : 3 × 4 : 3 × 5 = 8 : 12 : 15This Question Belongs to Arithmetic Ability >> Ratio
A/B = 2/3 = 2*4/3*4 = 8/12
B/C = 4/5 = 4*3/5*3 = 12/15
Therefore, A:B:C = 8:12:15
Which formula is used in it I don't understand.