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x:y =x: y

10: y =2:3

2y=30

y=15

y:z=y:z

15:z=3:5

3z=75

z=25

The value of z is 25.

The correct option is (B)

What is ratio?

A ratio indicates how many times one number contains another.

Given:

x:y = 2:3  and y:z = 3:5

As, x=10

10 : y = 2 :3

30 = 2y

y= 15

Now,

y:z = 3:5

15 : z = 3: 5

15*5 = 3z

z= 25

Learn more about ratio here:

https://brainly.com/question/17014002

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