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Question


If (64)2 - (36)2 = 20 x x, then x = ?

Options:
A .  70
B .  120
C .  180
D .  140
E .  None of these
Answer: Option D

20 x x = (64 + 36)(64 - 36) = 100 x 28



If (64)2 - (36)2 = 20 X X, Then X = ?      x =
100 x 28
= 140
20



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