Solved IB ACIO Question
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Q · Arithmetical Reasoningmedium · 45s
Sum of digits of two-digit number is 11; digits reversed number less by 9. What is number?
TopicArithmetical Reasoning
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.
Tens=x; units=11–x; original=10x+(11–x)=9x+11; reversed=10(11–x)+x=110–9x; difference=9; solve x=6; number=65.
Final Answer: Option B - 65