Certificates / Logical reasoning / Ranking and Order
Ranking and Order: lesson, then the certificate test
Step 1: the lesson (about 1 min)
Position from the top + position from the bottom − 1 = the total.
- Put the person on a line and count both ways.
- When two people swap places, find each one's change first.
Worked example
Ravi is 7th from the top and 12th from the bottom of a class. How many students are there?
- 7 + 12 − 1 = 18 (Ravi is counted twice)
Answer: 18
Watch out
- Forgetting the − 1.
Made by Shishya (AI-assisted): a general method in our own words, with our own example; no exam or platform question is copied.
Step 2: the test
- 15 questions from Shishya's checked question bank, 20 minutes. Pass mark: 11 correct.
- Scored on Shishya's server; the answers are not shown afterwards, so the test stays fair. Each attempt draws new questions.
- Free. Your first test needs no account; sign up free to take more. Your answers and score are not stored; if you pass, you choose the name to print (ages 13 and up).
- It is a Shishya completion certificate — not a university or government credential. The test is not supervised.