Question 602453
x:y = 1:2


x/y = 1/2

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y:z = 4:5


y/z = 4/5


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Now multiply the first equation by the second equation. You do this by multiplying each corresponding side separately.


(x/y)*(y/z) = (1/2)*(4/5)


(xy)/(yz) = (1*4)/(2*5)


x/z = 4/10


x/z = 2/5


x:z = <font color="red">2:5</font>