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Numbers - General Aptitude

Q1:

If (64)2 - (36)2 = 20 x x, then x = ?

A 70

B 120

C 180

D 140

E None of these

ANS:D - 140

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

      x = 100 x 28 = 140
20