INTELLIGENCE TEST??

This supposed INTELLIGENCE TEST is moderately diverting.. but certainly not very rigorous or intelligent. (far too much general knowledge required for one thing among many) 24 H in D -> 24 HOURS in a DAY 26 L of the A -> 26 LETTERS OF THE ALPHABET etc. I've got 27 of the first set so far but i am completely stumped as to how i find out the others (11, 13,20, 28, 30, 31).. i have pretty much given up so i was hoping that the site itself would have the answers somewhere but apparently not.. it just sends me to a second set of similarly fun but flawed puzzles . I can't really be bothered and they are clearly lying saying this one has no cultural bias.. i don't think they even know what that means! i would like the answers though so if someone more intelligent than me can work them out or figure out where they are accessible on the site, please let me know.