self Maths Puzzle

(4,2)=16.
(5,3)=20.
(6,2)=40.
THEN FIND (6,4)=??

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self Other Question

(5,2)=29.
(6,2)=48.
(7,2)=69.
(8,2)=92.
THEN (9,2)=?
if you have hundred zero,do any mathematical operation and make result as 100.