The letters are numbered as per their position in the alphabetical series.
RUBY = 18+21+2+25 =Â $$66\times\ 4=264$$
PAY = 16+1+25 =Â $$42\times\ 3=126$$
The pattern is sum of alphabetical orders is multiplied with the number of alphabets.
RUPAY = 18+21+16+1+25 =Â $$81\times\ 5=405$$
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