They would describe it as
Interpreting the numbers as atomic numbers of chemical elements and using their abbreviations, giving names of classical elements in different languages.
47 + 28 = ?
Ag + Ni = AGNI (Javanese for fire)
107 + 92 + 25 - 7 + 53 = ?
Bh + U + Mn - N + I = BHUMI (Sanskrit for earth)
6 + 1 + 53 = ?
C + H + I = CHI (Japanese godai term for earth)
26 + 92 = ?
Fe + U = FEU (French for fire)
16 + 92 + 53 = ?
S + U + I = SUI (Japanese for water)
22 + 68 + 88 = ?
Ti + Er + Ra = TIERRA (Spanish for earth)
23 + 85 + 52 + 7 = ?
V + At + Te + N = VATTEN (Swedish for water)
74 + 85 + 68 = ?
W + At + Er = WATER (English for water)
These puzzles are decode-solve-encode giving names of classical elements in different languages.
Ehad fo ocrn
= HEAD OF CORN = EAR = AER (Irish for air)
Eredantl estfor malmam
= ANTLERED FOREST MAMMAL = DEER = ERDE (German for earth)
Iekam isuoidolem isdnuos
= MAKE MELODIOUS SOUNDS = SING = IGNIS (Latin for fire)
= POSE QUESTION = ASK = KA (Japanese godai term for fire)
Tovey brveick brveand
= TOY BRICK BRAND = LEGO = LEVEGO (Hungarian for air)
Low un weucht; soirge of ullimunatuon
= LOW IN WEIGHT; SOURCE OF ILLUMINATION = LIGHT = LUCHT (Dutch for air)
Fivast playeva characteva fvaom Stvaeet Fighteva
= FIRST PLAYER CHARACTER FROM STREET FIGHTER = RYU = VAYU (Hindi for air)
JEDI GURU = YODA = VODA (Czech/Slovak/Finnish/Russian/Serbo-Croat/Slovene for water)
The different answers fit into the grid, with red spaces for words meaning FIRE, green spaces for words meaning EARTH, yellow spaces for words meaning AIR and blue space for words meaning WATER. Reading down the contiguous column then give ASK THE LOCAL GENTRY which resolves to "they will say it's ELEMENTARY" per the lyrics of the song "Love and Marriage" (thanks to Beastly Gerbil for this observation and the grid below).