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If a number is multiplied by three-forth of itself. The value thus obtained is 10800. What is that number?

210
180
120
160

Correct Answer: 120

Explanation:

Let the number be N
According to the question N x ( N x 3)/4 = 10800
⇒ 3N² / 4 = 10800
⇒ N² = (10800 x 4) / 3= 14400
N = √14400 = 120

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