If the ratio x:y = 3:5 and y:z = 4:7, find the ratio x:y:z
A
15 : 28 : 84
B
12 : 20 : 35
C
3 : 5 : 4
D
5 : 4 : 7
Verified Correct Answer: B.
Step-by-Step Mathematical Solution
x : y = 3.5, y : z = 4 : 7
x = 3 x 4 = 12
y = 5 x 4 = 20
y = 4 x 5 = 20
z = 7 x 5 = 35
then x : y : z = 12 : 20 : 35
Source: Myschool Past Questions Archive (Record #36302)