As a ratio, 7 is to 10 as what number is to 30?

At the Oscars for 1942 films, which composer opened the envelope and announced himself as the Best Song winner for "Whi… Which Mississippi native served as a White House spokesman under President Reagan in the 1980s? As a producer in 1997, who had several No. 1 hits, including his own "Can't Nobody Hold Me Down"? As a quarterback for the Oklahoma Sooners, which future GOP congressman was MVP of the 1980 and 1981 Orange Bowls? Japan's victory in its 1904-1905 war against which country gave it Port Arthur and southern Sakhalin? After the 1851 discovery of what in New South Wales and Victoria did Australia's population almost triple by 1860? As a result of the 1929 Lateran Treaty with Italy, which state became an independent nation? In the 1967 Six-Day War, Israel took control of which densely populated coastal strip on the Mediterranean?