This one's different to all the previous ones...
\begin{align}7+53&=28\\16+6&=21\\5+19&=97\\15+8&=\,?\end{align}
Can you find the value of the question mark?
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\begin{align}7+53&=28\\16+6&=21\\5+19&=97\\15+8&=\,?\end{align}
Can you find the value of the question mark?
answer
84
step1
convert all numbers to chemical element symbol
step2:
concatenate them to get R.H.S.
step3:
convert result to atomic number
e.g.
7+53=N+I=Ni=28
16+6=S+C=Sc=21
5+19=B+K=Bk=97