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

224
210
140
350

Correct Answer: 210

Explanation:

Let the number be P.
According to the question,
P - P/7 = 180
⇒ 6P/7 = 180
∴ P = 180 x 7/6 = 210

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