Question

13. If xy=7:9 and y:z=15:27 then x:z is

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Answer 1

Answer:

x/z= ; x:z=

Step-by-step explanation:

To solve this you need to adopt the fraction style of ratio presentation

x/y=7/9

y/z=15/27

Need x/z

Consider x/y×y/z

Write this as:

(x×y)/(y×z)

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As an example of what I am about to do consider 3×2. You have the same result if you reverse these numbers.

So 3×2=2×3=6

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So (x×y)/(y×z) = (x×y)/(z×y) = (x/z)×(y/y)= x/z

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⇒x/z= (x/y)×(y/z)= (7/9)×(15/27) = 0.432..