ReasoningAbility.com

Interchange with Unknown: Worksheet 2 - Beginner Practice Interchange with Unknown BEGINNER

Ready to master Interchange with Unknown? This entry level practice worksheet (2/10) presents 20 beginner-level challenges. Focus area: pattern recognition. Learn to solve interchange with unknown reasoning questions, handle interchange with unknown practice, and perfect interchange with unknown for competitive exams with our step-by-step solutions.

📝 Worksheet 2 of 10 • 20 questions • ⏱️ Estimated time: 20 minutes • 🎯 Beginner level

What you'll learn in this worksheet:
Your progress through Interchange with Unknown
Worksheet 2 of 10 (11% complete)

Question 1

In a row of 48 people, A is 13th from the left. After interchanging positions with B, A becomes 18th 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 18. So A's new right rank = total - new_left + 1 = 48 - 18 + 1 = 31.

Question 2

In a row of 48 people, after interchanging positions with B, A becomes 17th from the left and 32th from the right. If B was originally 15th 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 15, we can find A's original left rank = total - r2_right + 1 = 48 - 15 + 1 = 14.

Question 3

In a row of 54 people, A is 10th 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 = 54 - 18 + 1 = 37.

Question 4

In a row of 42 people, A is 12th 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 = 42 - 18 + 1 = 25.

Question 5

In a row of 42 people, A is 11th from the left. After interchanging positions with B, A becomes 15th 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 15. So A's new right rank = total - new_left + 1 = 42 - 15 + 1 = 28.

Question 6

In a row of 51 people, after interchanging positions with B, A becomes 19th from the left and 33th from the right. If B was originally 11th 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 11, we can find A's original left rank = total - r2_right + 1 = 51 - 11 + 1 = 11.

Question 7

In a row of 52 people, after interchanging positions with B, A becomes 17th from the left and 36th 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 = 52 - 14 + 1 = 9.

Question 8

In a row of 44 people, after interchanging positions with B, A becomes 18th from the left and 27th 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 = 44 - 14 + 1 = 14.

Question 9

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 10th 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 10

In a row of 43 people, after interchanging positions with B, A becomes 13th from the left and 31th 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 = 43 - 12 + 1 = 9.

Question 11

In a row of 52 people, after interchanging positions with B, A becomes 17th from the left and 36th from the right. If B was originally 10th 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 10, we can find A's original left rank = total - r2_right + 1 = 52 - 10 + 1 = 11.

Question 12

In a row of 48 people, after interchanging positions with B, A becomes 19th from the left and 30th 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 = 13.

Question 13

In a row of 50 people, A is 8th from the left. After interchanging positions with B, A becomes 13th 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 13. So A's new right rank = total - new_left + 1 = 50 - 13 + 1 = 38.

Question 14

In a row of 51 people, A is 10th from the left. After interchanging positions with B, A becomes 13th 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 13. So A's new right rank = total - new_left + 1 = 51 - 13 + 1 = 39.

Question 15

In a row of 41 people, A is 9th from the left. After interchanging positions with B, A becomes 15th from the left. B originally was 11th 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 = 41 - 15 + 1 = 27.

Question 16

In a row of 48 people, after interchanging positions with B, A becomes 23th from the left and 26th from the right. If B was originally 11th 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 11, we can find A's original left rank = total - r2_right + 1 = 48 - 11 + 1 = 15.

Question 17

In a row of 52 people, A is 13th from the left. After interchanging positions with B, A becomes 16th 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 16. So A's new right rank = total - new_left + 1 = 52 - 16 + 1 = 37.

Question 18

In a row of 51 people, after interchanging positions with B, A becomes 17th from the left and 35th 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 = 51 - 13 + 1 = 14.

Question 19

In a row of 41 people, after interchanging positions with B, A becomes 20th from the left and 22th from the right. If B was originally 17th 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 17, we can find A's original left rank = total - r2_right + 1 = 41 - 17 + 1 = 14.

Question 20

In a row of 41 people, after interchanging positions with B, A becomes 16th from the left and 26th 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 = 41 - 16 + 1 = 13.
Previous Worksheet Next Worksheet