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Polity·2019·Easy

When a runner was crossing the 12 km mark, she was informed that she had completed only 80% of the race. How many kilometres was the runner supposed to run in this event?

When a runner was crossing the 12 km mark, she was informed that she had completed only 80% of the race. How many kilometres was the runner supposed to run in this event?

Options

  1. a.

    14

  2. b.

    15

    Correct answer
  3. c.

    16

  4. d.

    16.5

Explanation

Answer is (b). This can be solved mentally. 12 km is 8/10 = 4/5 of the whole race. So whole race must be 15 km. In this question 12 km is 80% of the total race. => 12 km = 0.8 R => R = 12 / 0.8 = 15. So total race will be of 15 km.

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