What will come in the place of question mark? DE : 10 :: HI : ?

18 30 36 72

36

DE : 10 :: HI : ? (4)(5) : 10 :: (8)(9): ? The pattern observed in the above question is as follows: 5 x 4 = 20 ⇒ \(\frac{20 }{2 }\) = 10 Thus, 8 x 9 = 72 ⇒  \(\frac{72 }{2 }\) = 36