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Ranking and Ordering · Question 38 of 66

Question 38

MediumOriginal question

Farah and Gopal stand in a row facing north, and Gopal is 9th from the left end. When they interchange places, Farah moves 6 places to the right and ends up 11th from the right end. How many people are in the row?

Options for question 38

Show the answer and explanation
CorrectNot quiteAnswer A

Correct answer: A

Explanation

  1. Farah moves into Gopal's place, so her new place is 9th from the left.

  2. That place is 11th from the right.

  3. Total =9+11−1=19= 9 + 11 - 1 = 19. (Farah was at 9−6=39 - 6 = 3rd from the left.)

Worth noting

25 adds the 6 places to Gopal's position, as if Farah ended at 9+6=159 + 6 = 15. She ends where Gopal WAS. 20 forgets to subtract 1.

Concept
Interchange described by a shift
Typical time
70 s
Your time
—
The rule this testsInterchanged positions
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Ten questions from Ranking and Ordering, at your own pace.

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