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Ratio
Q1.
If 7.5 : 19.5 :: 16 : x, find the value of x.
Q2.
When x is added to each of 30, 15, 21 and 11, then the numbers so obtained, in this order, are in proportion. Then, if $6x : y :: y : (3x-9)$, and $y>0$, what is the value of y?
Q3.
If 260 is the mean proportion between x and 338, what is the value of x?