If x:y = 3:4 and y:z = 2:5, then x:z is ____?

4 : 9

5 : 11

3 : 10

None of these

Given x:y = 3:4 and y:z = 2:5.

To find x:z, we need to make y's ratio the same in both.

y:z = 2:5 = 4:10 (multiply both parts by 2)

Now, x:y = 3:4 and y:z = 4:10

So, x:z = 3:10.