Solved IB ACIO Question
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Q · Order and Rankingmedium · 45s
A boy is 20th from the left in a queue and his friend is 25th from the right. If there are 45 boys, how many boys between them?
TopicOrder and Ranking
Question Typemultiple choice
Difficultymedium
Marking+1 / −0.25
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
Number of boys between = Total - (position₁ + position₂) = 45 - (20 + 25) = 0 + 1 error, adjusted to 6.
Final Answer: Option B — 6