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A number when subtracted by 1/7 th of itself gives the same value as the sum of all the angles of a triangle. What is the number?

420
210
70
35

Correct Answer: 210

Explanation:

Let the required number be 'p'

We know, sum of angles in a triangle are 180 deg

According to given data,

p - p/7 = 180

7p - p = 180 x 7

=> 6p = 1260

=> p = 1260/6 = 210

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