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Interchange with Unknown - Expert Level: conceptual clarity Interchange with Unknown EXPERT

This skill evaluation ⚡ worksheet focuses on Interchange with Unknown - a key topic in Number Ranking. You'll solve 20 expert-level problems (Worksheet 9 of 10). The primary focus is on conceptual clarity. Master interchange with unknown ssc cgl, interchange with unknown reasoning tricks, and fast interchange with unknown solving through systematic practice.

📝 Worksheet 9 of 10 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Expert level

What you'll learn in this worksheet:
Your progress through Interchange with Unknown
Worksheet 9 of 10 (88% complete)

Question 1

In a row of 51 people, A is 10th from the left. After interchanging positions with B, A becomes 16th from the left. B originally was 10th from the right. What is A's new rank from the right?
After interchange, A's new left rank is 16. So A's new right rank = total - new_left + 1 = 51 - 16 + 1 = 36.

Question 2

In a row of 44 people, after interchanging positions with B, A becomes 20th from the left and 25th from the right. If B was originally 13th from the right, what was A's original rank from the left?
Since B took A's original position, and B's original right rank was 13, we can find A's original left rank = total - r2_right + 1 = 44 - 13 + 1 = 13.

Question 3

In a row of 39 people, A is 15th from the left. After interchanging positions with B, A becomes 18th from the left. B originally was 13th from the right. What is A's new rank from the right?
After interchange, A's new left rank is 18. So A's new right rank = total - new_left + 1 = 39 - 18 + 1 = 22.

Question 4

In a row of 44 people, after interchanging positions with B, A becomes 13th from the left and 32th from the right. If B was originally 12th from the right, what was A's original rank from the left?
Since B took A's original position, and B's original right rank was 12, we can find A's original left rank = total - r2_right + 1 = 44 - 12 + 1 = 9.

Question 5

In a row of 39 people, A is 15th from the left. After interchanging positions with B, A becomes 18th from the left. B originally was 18th from the right. What is A's new rank from the right?
After interchange, A's new left rank is 18. So A's new right rank = total - new_left + 1 = 39 - 18 + 1 = 22.

Question 6

In a row of 44 people, A is 11th from the left. After interchanging positions with B, A becomes 15th from the left. B originally was 18th from the right. What is A's new rank from the right?
After interchange, A's new left rank is 15. So A's new right rank = total - new_left + 1 = 44 - 15 + 1 = 30.

Question 7

In a row of 40 people, A is 14th from the left. After interchanging positions with B, A becomes 21th from the left. B originally was 13th from the right. What is A's new rank from the right?
After interchange, A's new left rank is 21. So A's new right rank = total - new_left + 1 = 40 - 21 + 1 = 20.

Question 8

In a row of 36 people, A is 12th from the left. After interchanging positions with B, A becomes 16th from the left. B originally was 12th from the right. What is A's new rank from the right?
After interchange, A's new left rank is 16. So A's new right rank = total - new_left + 1 = 36 - 16 + 1 = 21.

Question 9

In a row of 46 people, A is 13th from the left. After interchanging positions with B, A becomes 16th from the left. B originally was 14th from the right. What is A's new rank from the right?
After interchange, A's new left rank is 16. So A's new right rank = total - new_left + 1 = 46 - 16 + 1 = 31.

Question 10

In a row of 38 people, A is 12th from the left. After interchanging positions with B, A becomes 16th from the left. B originally was 15th from the right. What is A's new rank from the right?
After interchange, A's new left rank is 16. So A's new right rank = total - new_left + 1 = 38 - 16 + 1 = 23.

Question 11

In a row of 41 people, A is 10th from the left. After interchanging positions with B, A becomes 14th from the left. B originally was 18th from the right. What is A's new rank from the right?
After interchange, A's new left rank is 14. So A's new right rank = total - new_left + 1 = 41 - 14 + 1 = 28.

Question 12

In a row of 50 people, A is 15th from the left. After interchanging positions with B, A becomes 23th from the left. B originally was 18th from the right. What is A's new rank from the right?
After interchange, A's new left rank is 23. So A's new right rank = total - new_left + 1 = 50 - 23 + 1 = 28.

Question 13

In a row of 39 people, after interchanging positions with B, A becomes 19th from the left and 21th from the right. If B was originally 18th from the right, what was A's original rank from the left?
Since B took A's original position, and B's original right rank was 18, we can find A's original left rank = total - r2_right + 1 = 39 - 18 + 1 = 12.

Question 14

In a row of 35 people, after interchanging positions with B, A becomes 18th from the left and 18th from the right. If B was originally 14th from the right, what was A's original rank from the left?
Since B took A's original position, and B's original right rank was 14, we can find A's original left rank = total - r2_right + 1 = 35 - 14 + 1 = 12.

Question 15

In a row of 40 people, A is 8th from the left. After interchanging positions with B, A becomes 13th from the left. B originally was 18th from the right. What is A's new rank from the right?
After interchange, A's new left rank is 13. So A's new right rank = total - new_left + 1 = 40 - 13 + 1 = 28.

Question 16

In a row of 35 people, after interchanging positions with B, A becomes 15th from the left and 21th from the right. If B was originally 14th from the right, what was A's original rank from the left?
Since B took A's original position, and B's original right rank was 14, we can find A's original left rank = total - r2_right + 1 = 35 - 14 + 1 = 12.

Question 17

In a row of 48 people, after interchanging positions with B, A becomes 22th from the left and 27th from the right. If B was originally 16th from the right, what was A's original rank from the left?
Since B took A's original position, and B's original right rank was 16, we can find A's original left rank = total - r2_right + 1 = 48 - 16 + 1 = 14.

Question 18

In a row of 39 people, A is 12th from the left. After interchanging positions with B, A becomes 20th from the left. B originally was 16th from the right. What is A's new rank from the right?
After interchange, A's new left rank is 20. So A's new right rank = total - new_left + 1 = 39 - 20 + 1 = 20.

Question 19

In a row of 53 people, A is 13th from the left. After interchanging positions with B, A becomes 16th from the left. B originally was 17th from the right. What is A's new rank from the right?
After interchange, A's new left rank is 16. So A's new right rank = total - new_left + 1 = 53 - 16 + 1 = 38.

Question 20

In a row of 53 people, A is 14th from the left. After interchanging positions with B, A becomes 20th from the left. B originally was 17th from the right. What is A's new rank from the right?
After interchange, A's new left rank is 20. So A's new right rank = total - new_left + 1 = 53 - 20 + 1 = 34.
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