When RNA is hydrolysed, there is no relationship among the quantities of different bases obtained. What does this fact suggest about the structure of RNA?

The structure of DNA is completly different from RNA .In case of DNA which has a double staranded structure the bases are paired adenine pairs with thymine wherees cytosine pairs with guanine.due to such definte structure DNA molecule is hydrolysed in definite molar ratio whereas there is no such structure in case of RNA .Here different bases are formed in different molar ratio.This suggests that the structure of RNA is single stranded