Each letter is represented by their position in the English alphabetical series.
E-5, A-1, S-19, T-20 = (5+1+19+20) = 45$$\times4$$= 180
N-14, O-15, R-18, T-20, H-8 = (14+15+18+20+8) = 75$$\times5$$=375
Pattern is after adding the digit we have to multiply with the number of alphabet in the words.
SOUTH,
S-19, O-15, U-21, T-20, H-8 = (19+15+21+20+8) = 83$$\times5$$ = 415
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