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When 1⁄ 7 of the number is subtracted from the number itself, it gives the same value as the sum of all the angles of a triangle. What is the number?

224
210
140
350

Correct Answer: 210

Explanation:

Let number be the x.
According to the equation , x - ^x⁄₇ = 180
⇒ ^6x⁄₇ = 180
∴ x = 210

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