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11. | If (64)2 - (36)2 = 20 x x, then x = ? | |
A. | 70 | |
B. | 120 | |
C. | 180 | |
D. | 140 | |
Answer: Option D | |||||
Explanation: | |||||
20 x x = (64 + 36)(64 - 36) = 100 x 28
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