A two-digit number has digits whose sum is 10. Reversing its digits makes the number 36 smaller. What is the original number?
- A.37
- B.46
- C.64
- D.73 ✓
Explanation: Let the digits be t and u with t+u=10. Original−reversed = 9(t−u) = 36, so t−u=4. Solving with t+u=10: t=7, u=3 — the number is 73.
Class 6 IMO Mathematics Olympiad practice · HOTS / Achievers · Multi-Concept Achievers
← All Multi-Concept Achievers questions