Question 2663
12/24=X/100

12 - X
24 - 100

Consider them as such:

12 is to X what 24 is to 100

Cross multiply to get the value of X

X=(12*100)/24=<B>50</b>
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In other words,the ratio of 12 to 24 is the same ratio of X to 100,that is half.
If the ratio was to change,the value of X would accordingly change also.
<P>
Hope this helps,
best of luck.