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  1. 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 ?
    1. 224
    2. 210
    3. 140
    4. 350
Correct Option: B

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


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