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Difficulty: 4/102024 IOQM 2024 (Q13)

Three positive integers a, b, with > satisfy the following equations: ac + + = bc + + 66, + + = 32. Find the value of a.

Guide / Hint

Hint 1: Start by analyzing the initial conditions and setting up the basic equations. A, b, I+.

Hint 2: Look for algebraic properties, symmetry, or geometric theorems to simplify. ac + + = bc + + 66, + + = 32.

Hint 3: Proceed with the final algebraic steps to solve the system. => c(a – b) + (b – a) + solve for the final value.

Solution

Step 1: A, b, I+

Step 2: ac + + = bc + + 66, + + = 32

Step 3: => c(a – b) + (b – a) + = 66

Step 4: => (a – b) (c – 1) + (c – 1) = 66 – 1

Step 5: => (c – 1) (a – + 1) = 65 = 1 × 65 = 65 × 1

Step 6: = 5 × 13 = 13 × 5

Step 7: c – 1 = 65, + 1 = 1

Step 8: => = 66, but + + = 32

Step 9: => not possible

Step 10: c – 1= 1, + 1 = 65

Step 11: c = 2, = 64

Step 12: a + + = 32 => + = 30

Step 13: => 2a = 64 => = 47, = –17 not possible

Step 14: c – 1 = 5, + 1 = 13

Step 15: c = 6, + i = 26

Step 16: a – = 12

Step 17: => = 19, = 7

Step 18: c – 1 = 13, + 1 = 5

Step 19: => – 1 = 13, + 1 = 5

Step 20: => = 14, = 4

Step 21: a = = 18

Step 22: => = 11 but < c

Step 23: => only = 19

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    2024 IOQM 2024 Q13 - Olympiad Math Olympiad Question | Leminno