List of top Mathematics Questions on Ratio and Proportion asked in JEECUP

If \(7x : 63 = 1 : 9\), then \(x\) is
If \(9 : 15 : : 45 : x\), then the value of \(x\) is
If \(a : b = 3 : 4\) and \(b : c = 8 : 9\), then \(a : c\) is
If 15% of \(m = 20%\) of \(n\) then \(m : n\) is