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Question

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


Options:
A .  70
B .  120
C .  180
D .  140
Answer: Option D

20 * x = (64 + 36)(64 - 36) = 100 * 28
  x =    `(100 * 28)/20`    = 140



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